Very Good Value
I love this little keyboard! I have other nicer (and more expensive and heavier) keyboards, but I use this one more. Although supposedly designed as an "arranger" keyboard, this is a great choice for those small jobs for which portability and quick setup are essential, and which don't require lots of gear. It really will do the job of a stage piano. I rarely use the "arranger" aspects, although they do appear to be of good quality. If you are a concert pianist, only like Nord synthesizers, or are used to Hammonds with a full 100 lbs Leslie speaker, you will be disappointed - but the low weight (under 19 lbs!) and low cost will please the rest of us. The leslie effect is more realistic than other keyboards costing much more, and is quite usable. The dimensions are reasonable, too, helped by having 76 keys instead of 88 - which are enough to play almost all solo and 2-handed parts, but keep the thing small enough to fit in most car trunks. Splits and layers are also quickly accessible. With battery power, built in speakers, and a removable music stand, it is possible to do a gig bringing only this keyboard, a keyboard stand, and, if you use them, a sustain pedal and stool - sure the room can't be too big, but you can carry everything with you in one trip, or even on your back using public transportation! And if you want to use an amp, there is a full size line out.
Important Nitpicks: no MIDI in/out (only USB), no Mod wheel, and I'd prefer the wheels to be over the keys instead of beside them. (I'd really prefer a touch strip for pitchbend, but those are not common anyway.) The absence of a CV pedal input is a somewhat serious oversight considering the effort Casio put into other organ aspects; it irritates me because I could route my volume pedal through my pedal board if there was a midi input (no computer needed). If either one of these difficiencies were corrected, I'd give a 5-star review.
Finally, it doesn't sound like a $4,000 keyboard, but it sounds really good for the price. Think value - this is a reliable Ford, not a Mercedes, or a nice Android tablet instead of a desktop Mac. Judge it for what it is, and you will be impressed.