What characteristics have motivated your choice? :

The semi-weighted keys, weight, height, knobs / pads ....
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What connector (MIDI pedals ...)?

MIDI In / Out, USB, 2 Pedal Jack, DC 12V

UTILIZATION

The touch keyboard is it nice? Should your use?

Yes, very nice, the 25 semi-weighted keys are very pleasant to the touch, they are ideal for composing music electro ...
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The manual is clear and sufficient? ...

The Manual is provided on the CD (so no paper manual), it is clear in all ...
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The general configuration is simple? The selection of MIDI channels, patches is easy?

Very easy with Ableton Live (almost nothing to do), more complicated with Reason (Reason need to download Remote Control, assignment of more complex pads ....)
Remains correct throughout.

OVERALL OPINION

For how long have you been using it?

For the past year and a half.
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Did you try many other models before getting this one?

No
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What thing do you like most/least about it?

Less: notched knobs (which soften with use), not very practical with Reason