I bought a RISE 25 for a very low price during the recent KVR auction. I'm actually quite happy with it. I could understand why a keyboardist would hate it, but as a guitarist who sucks at keyboards, I'm happy.
A few notes:
1) I'm extremely impressed with Cycling 74's all-in support for MPE. The MPE objects and bPatchers made with ROLI are very high quality. Every single one worked on both Windows and OS X the very first time I tried it (which, in the world of boutique controllers, is unfortunately a rarity). One of the really cool bPatchers is a step sequencer where you set each step with the vertical position on each key. I've been creating MPE mini-instruments and effects in Max, mainly because...
2) MPE support sucks on most DAWs. Ableton Live doesn't support it at all right now, which is a huge disappointment (I didn't realize this before purchasing). Weird how Cycling is all-in but Ableton is behind. Even setting up RISE->Aalto in Bitwig was more fiddly than I would have liked (you have to right click on Aalto's box in Bitwig and select "Force MPE Mode"; this took a bit of forum diving).
3) Equator is a very impressive software bonus. There's a lot of depth to the synth, and it's very easy setting up MPE modulation targets.
4) I haven't tried Bluetooth or iOS interaction yet. The whole idea of using this massive keyboard with my iPad seems pretty humorous. I haven't tried Blocks yet, either, but I'm buying a set the moment the developer box goes on sale.
5) Regarding @Rodrigo's theory of "shitty MPE", I definitely spent half an hour tweaking the velocity and sensitivity curves to my liking. The ROLI Dashboard that comes with it allows you to save a curve profile to the keyboard. The pitch bend, vertical slide, and pressure curves can be modified directly from the hardware interface, which is a nice touch (alternatively, they can switch into CC mode). I think a lot of that sound comes from demos of people trying to play it like a regular keyboard, where most videos of the Continuum and Soundplane feature musicians who are very aware of the different paradigm.
6) The main reason I bought one is to add MPE support to Unfiltered Audio's future instrument releases. As a developer, I can say that the SDK that ROLI has released through JUCE is very nice and intuitive. Again, this goes back to point 1: I'm excited about how much support they've given to developers through multiple avenues.