I really like the EXR7s. It is much different than the 5 or 3 models. The keybed is terrific. There are dedicated banks for both sounds and styles, but not in the other boards. The GW-7 has very small keys, like an accordian. The styles in the GW and EXR are very similar. The EXR has built-in speakers, not in the GW. All of the Roland manuals can be downloaded for free from the ROLAND USA site to answer specific questions. Just my opinion.
zuki