tc electronic Sub'N'Up Mini Octaver

I'll outline how I use this just in case any other acoustic guitarists are looking for a way to beef up their sound. Works great for me.
If you rig up a sound hole pick up vertically (not the usual horizontal way) the pick up basically only picks up your E and A strings fed into the Sub n Up with the dry and octave up turned off - then mixed with your guitar pick up (I use K&K on my Martin) you can subtly really beef up the acoustic sound with bass. This makes a really big difference to my solo sound.
The Sub n Up tracks extremely well - I also have a POG which tracks the best - however it can sound very - synthetic ... the Sub n Up has a huge bass sound which is more like a double bass sound and dynamically much more lifelike. Be careful you don't over do it if you want a subtle mix.
I've never used the other features as this was bought purely to give my acoustic guitar a better range on the E, A and about 50% of the D string without affecting the treble strings.
Great product for the price and very accurate.

I bought the sub n up after selling my Pog2.
As I still needed the octave function, I decided on the Mini sub n Up as a fairly cheap alternative after wasting a lot of money on a Pog. The brilliance of this pedal is that it removed the hassle of having too many presets, options and switches (as the Pog2 has) on a pedal.
I liked the Pog2 and it's a great pedal to have, it just gets too overwhelming for someone who just occasionally uses the octave for certain things.
Now about the pedal itself, it has a very wide range of possibilities within such a tiny 3 knob item. The toneprint/editor is a great feature for tweaking whatever sound you want. From simple octaves, classic, polyphonic and organ-like sounds, adding tremolos, lowpass or hipass filters through the editor, you can really get what you can also get from the Pog (without nitpicking quality, it is up to scratch) minus all the hassle. It tracks well, adds a good body to the sound and has personality. All in all a must for such an affordable price.