I don't recommend you to do it :
1) plenty of bugs + heavy
2) you don't need it in your company since you don't even work with a .NET 3 Framework...
P.S It is nice to see you here, our QA guy who tried to install V8 saw your question so I recognized you by your nickname. In my current company QA needs it to test the application since we are using .NET 3.5 Framework + SP1 - in our case it's must.
If you have some particular questions you can write me an e-mail or just call me.
Aramis, have you had many problems with .net 3.5 and the latest RFT. I have to test WPF applications written with the .Net 3.5 SP1 framework and this doesn't work properly, just wondering what your experience is.