Different boards..apples to oranges..
Casio models have speakers, 76 keys, Smart media card, great drawbar organs and effects..these are the highlights..

Roland has 16 track sequencer, customize ability of styles, D-beam controller, other then organs[advantage to Casio],the sounds are comparable..key feel is also comparable..

The GW-7 has no speakers and has 61 keys..

I am a Roland fan,if I was looking for a lightweight backup keyboard, or a keyboard for small 1 or 2 hour jobs...I would select the Casio..with 76 keys and a great organ[matter of fact that is what I did]...besides that..the $300 I saved will buy a lot of cheesesteaks..

If you already own thr GW-7, don't sweat it , play it ..it's a useable keyboard..