I am looking for a small sized midi controller to controll mainstage including VST's and ipad apps.. (My previous one a novation nocturn just broke down)

I gathered some video's about my current interests HERE

Currently the models :
Samson Graphite MF8
Akai LPD 8
Korg nano Control 2
Arturia Beatstep


Anyone using one of these models, that would like to share his experience overhere?
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Yamaha Genos, Roland Jupiter 80, Ipad pro.

http://keyszone.boards.net