I don't know if anyone mentioned it; but I personally would not recommend ripping a 4x8 sheet on a table saw period. Kick backs greatly increase unless you have a perfectly aligned saw and you are very very careful.
I always cut my 4x8's in half first before tossing them on the table saw.
All consumer table saws will have their limitations. I grabbed the Rigid 4511 when it first came out, and have been fairly happy. That being said, most all TS's will benefit from a fence upgrade. I am always fighting keeping the fence aligned repeatably. A good blade is also mandatory, as the ones that come with them from the factory are junk.
IMO, I would rather go with a rip fence and circular saw than a cheap table saw.
Psychotic Episode Averted