This keyboard fits neatly on the Ikea shelf next to my desk.
If like me you are using it with Reason, after installing the drivers from the bundled CD, you turn it on by plugging in the USB cable, turn the main knob one to the right to select Reason, press the knob, and that's pretty much it in terms of setting it up. It works with a whole bunch of other digital audio workstations as well, but I can't really comment about them as I just use Reason.
It is this speed of getting going that has really impressed me. The last time I tried to use Reason and a midi keyboard I completely failed, and after a couple of years the keyboard found itself down the local tip, never having been used. I play with this one every day and feel vaguely creative, which is what I was hoping to get out of it.
Other things I like are the touch sensitive keyboard, lots of assignable knobs, arpegiator that makes me think I can play the keyboard, clear display. It feels like a reasonably professional keyboard, just with 25 keys.
The only downside might be if you want more keys. In which case you buy one of its bigger brothers like the MPK49. That wouldn't have fitted on my shelf so wasn't really an option for me.