I have been making electronic music for years on computers and always found it tough to be inspired and come up with ideas. This has been a real game changer for me.
It takes a little bit of figuring out but once you learn a workflow for this device it is unbelievably useful. You can load a sample/synth patch on a pad in seconds, tweak almost everything you could want to the sound, add effects and record a performance moments later.
The only draw backs I can see are;
The device can only play a limited number of individual sound sources at one, and once you hit this limit it will cut off something to play the next source.
The sound quality, while decent, is not superb.
The labeling for all the knobs is nigh-on impossible to see in low light.
Creating new samples and loading them onto an SD card can be time consuming and tedious.
It's ruggedly built, aluminium housing I think, and comes with a power supply though it can run for quite a while on batteries, especially in low-power mode.
All in all it is a big thumbs up from me, I would definitely recommend it. The only problem I had when deciding to buy this was whether I would get this or the original (non sampler) version.