@Trueman832: I haven't seen any of your described issues as yet, after trying several of the Dell/Bizlink adapters at work. If its behaving as you've described, then there may be a problem with the unit.
Slightly OT: I am current running the exact same setup you were (GTX295 + TH2Go) but will be trying a "test run" of a 5870 + Eyefinity this weekend
I'll post back with impressions and more once thats done, as well as a few benchmarks if i get the chance.