Feature:
As stated before the effects are very good. There are alot of effects to add some zest to the sounds. The synth function, though not well equipped, is functional; hey what do you expect from a keyboard under $250.00? The sequencer seems ok. It's a scratch pad sequencer. Something to get your ideas down quick. Select a beat and start playing.

Quality:
Well it's made of plastic. I dare not to drop it or smack those keys so hard when I'm playing; fear I might break the keys. But it seems well put together.

Value:
I'll tell ya the ctk691 is full of good sounds, and effects, plus expandability! And the keyboard looks great. A good value for the money. I checked out the Yamaha psr292, and the only things the psr292 has over the casio ctk691 is its ep. sounds and the education suite feature, which I really don't need.

Desirability:
Like I stated before the ctk691 looks great! The blue screen is very cool. And surprisingly the keys feels great to play; for me at least. You have to go and check it out for yourself.

Sound:
The sounds in the ctk691 are very good. Lots of pianos and organs to mess around with. With the pianos there isn't much variation between them. But what I did was pull some of the pianos to the user area and used the synth function to change them up a little. I also used some of the effects,which are very good,to spice them up. No other keyboard in this price range can do this. Casio has made some good advances here.

Support:
Haven't dealt with Casio support center yet. I guess time will tell. The Casio Music Site seems well maintained. They promised an update in March; we'll see.

Overall:
Overall a great sounding keyboard! If lost or stolen I'll buy another one. For the cost of this keyboard it does what I expect of it. Probaly later I will buy a full fledge keyboard workstation. But for now I have the ctk691 for which I'm very satisfied with.