I have had my Gtablet for about a year, and I have tried many roms.
FY,GB,HC,ICS,etc. Various incarnations. (Well, only 1 ICS)
From my understanding, Viewsonic, like many companies,
uses various suppliers for components, so the individual results with roms will vary.
And the physical build may vary. eg/ Volume (+) is actually (-)
(this is a reported build difference that my tablet has)
I seem to come back to Froyo roms for many reasons. Base platform OS.
Hardware acceleration. Stability. Etc.
Personally, I haven't found a newer gen rom that works as well as Froyo.
As stated on this and other sites, Be sure you follow the recomended
procedures for pre and post install. usually posted in the OP.
Really get to know and understand NVflash.
I always come back to the C+C rom final version. Beasty, although nice,
wouldn't do what C+C does for me.
I use my tablet as much, if not more than I use my PC, and I can run Splashtop
to access my pc, which is cool.
I do find certain games or apps that wont work, but, I am patient.
No problems with google apps.
It really comes down to researching, and testing, and finding out
the best rom for you and your tablet.
After all, this support, is almost free. Kudos to the devs.
sorry. this is on another post. hope that is ok.