We have a GS 2008 8327 Independence (FRED) with the slide you are asking about. It and the other two slides have been trouble free.
I think the coach we have is a good one, no experience with other GS products. The outside storage access (doors) leaves a bit to be desired.
We bought it used (18000 miles) two years ago and the only problems have been minor ones with the generator -a coolant leak and temperature sender failure.
2008 Gulf Stream 8327 Fred, 300hp Cummins, Allison MH1000, Freightliner, 24k lbs chassis
2004 Ford Ranger 4x4 5spd, 4k lbs, flat towed