I use the keyboard at home, playing from time to time as a hobby, composing some songs.
The keys are amazing, compared to similar keyboards with more techie features. This is the deal actually, with that one you don't have all the features that other models might have, but at least you have decent keys to play. It's not close to piano keys, but the feelings is very nice.
I don't have any negative to say. People might say that you need to spend some time to program it as a negative thing. Well, in my case I don't need that much of a hacks. I just need to plug and play. Easy stuff like volume, velocity etc are super easy to be adjusted, so for normal use it's 100% perfect.
Good quality, nice looking, but functionally limited
Well, let me start by saying that this is a beautiful keyboard. In my opinion, it looks among others in its price range.
And the build quality is quite good. I compared it to numerous competitors that all turned out be inferior (some keyboards feel excessively plastic, or the keys produced an unpleasant mechanical squeaky sound of the springs inside). None of the sort with this one.
And yet this keyboard is not without problems. First and foremost, you cannot use it without a computer. Period. I repeat: it is only powered by a USB cable connected to a computer with previously installed drivers. You cannot power it any other way. And this is the biggest disappointment for me. I planned to use it both?with a computer and, alternatively, with my Roland SD-50 sound module. Alas, it cannot be used _just_ with the sound module. This fact is not so apparent even for Roland's own customer service, as I came to know, so please bear in mind this "feature".
The other problem that I've had with this Roland keyboard is software update (not the driver, but the keyboard's own internal ROM or whatever you call it). At Roland's web page there is an update that promises to fix some key velocity issues or the like. I tried to install it by closely following the instructions, but it never worked. So I just keep using it with the old software version.
Apart from that, it is a very nice keyboard.
Answer from thomann: it works standalone with an power supply "USB - to - IEC C7"
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