Behringer X-Touch Mini

The most capable mini desktop controller so far.
Using it for Logic in Mackie Control mode for track control
and MainStage in User mode to control live instruments.

Pros
LED-collar pots are not very common in backpack-sized controlles,
but does it's job well and really helpful to make small adjustments on the fly and not get lost among patches and tracks pre-sets.

Cons
The app to re-assign User A/B layes is Windows only.
While not used very often after initial setup and not a big deal,
it's still a shame for a good product with creative folks in mind.

Programming

Logic is ready to go out of the box with no adjustments at all.
While many of "full sized" Mackie Control functions can be reached in need, actually using them blindly without "big brother" LCD screen can be tricky, except you already know all of them by heart. Using basic functions such panning, muting, soloing and navigating track marks is as simple as it can be.

MainStage takes some time to assign knobs and buttons for live patches, but finally can be tailored as much as you bother to think about.

Another cool feature, controller can be switched from Mackie mode to User mode externally, which let you program assignable button to instantly activate Logic app to scroll through the track or adjust some track channel strips, and switch back to instrument controls without need to reach your computer controls!

Active knobs and buttons for MC and User modes remembered separately, so they remains as they were when switching from one mode to another and back.

Re-assignable User A/B layer controls found it's use to assign essential functions be active on both A and B layers at the same time.

All in all, this small gadget does way more then can be expected
from portable controller and quite handy for rehearsals or even live sessions whether you feel like less reverb or more modulation is appropriate.
For studio work, however, the preference is on studio sized LCD text consoles.

Bought two X-Touch minis cause seemed to be just what we needed so our 2 guitarists could have their own FX board in our live electronica setup.

I was looking into using the MC mode but it's not really scalable as you can only control devices of one single track in Ableton - and they also sing and play keys and need to control more than 1 track. There are some painful and bit technical ways to workaround plus you need some desktop app – only for Windows (:O). So I ended up linking all midi manually.

The device has A/B mode, so when connecting two at the same time, each of the guitarists chooses and controls their own profile with the corresponding configuration. So you can't really add a third or fourth one, but they can actually control each other's FX by switching A/B, which is quite fun :)

Build is decent and has macro controls with lights, good for dark/club environments. When not connected via MC, the led lights do not work so well but get the job done.

Overall, it worked fine for our setup and actually gave a lot of power to the guitarrists for 60€, so pretty happy with it.

I use this X-Touch MINI in my Studio, as an extension to my main controller.

Using an USB extension cable, I have installed 2 of theses on different corners of the room, so I don't have to keep going back to the desk to Stop, Start, Record etc.

The Pots, Buttons, and single Fader can all be programmed to work within any DAW. Logic Pro uses the utility of Learn to connect devices to the software.

I personally use the assignable push-buttons for different screen views and controls like Save, and Undo, and the assignable Pots for controlling settings within Plug-ins. Compression settings, EQ settings etc. The Fader is sometimes used as a channel fader, but I find myself using it more as an Expression/Volume Fader, when I play Live-Keyboard with Strings ... adds a more atmospheric and harmonious feel to the sound.

I would recommend this product.

Handeling photoediting software in the way you feel it.
No need to look for the tens of sliders in small window. Motoric memory does it. Hands remember. I keep mine so, that for each finger is own encoder, and thumbs rotate them.
Processing ("developing") photographs with MIDI controller is a giant jump.
I use xtouch mini with midi2lr and adobe lightroom.
Comes with long mUSB cable. I keep controller on my lap, so hands are relaxed.
Only ONE cable, that's all you need.
X-touch mni is compact to take it with you anywhere.
as a bonus, you get universal controller for anything else.

EDIT: I've had this thing sitting on my desk rent free for a good long while now and i've figured out how to 'program' this thing using remote scripting in ableton. With some effort you can make this thing do pretty much whatever you want. I've set mine to dynamically switch to midi parameters of selected devices, it can launch specific plugins, it becomes a single channel mixer, etc. It's magical.
even without that, it's great to just midi-map things and give it to a not-so-technical band member.

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Below is the original review:

I was looking for something with some endless rotary knobs so that when i launch clips in ableton, the knobs jump to the position of any modulation on the clip. These are fairly hard to find or expensive. This little box is cheap and does the trick.

I've seen people use it in video's and it automagically conforms to the DAW and can control VST's. I assume it uses automap. I haven't found a way to do this yet, and that annoys me.
The setup therefore is as simple as any midi controler with knobs and no proprietary software, but it would be nice to have some software control on it.

Buildquality is what you'd expect. Plastic but durable. Knobs and buttons seem fine, but i haven't been abusing it yet.
Form factor is nice and small. could have been slightly smaller so it fits with novation's launchpads but oh well...