I first rented this on the off chance that it would be as good as GHWT. It is so much better. For a start its easier to use the drums with, and it feels better, not that Im a drummer. The guitars, both bass and lead feel stronger and you can put it on a higher level and still keep up, even me.
I bought the GHWT band in a box and had not really played it, but renting this has had myself and my son on it every night, with a singer from XBOX live to make up the band (couldn't find a drummer). Its really cool and well worth a rental, so good in fact that I ordered RB2.