the only reason I can think of to combine V2 SLI with a TnT2 Ultra, is image quality.
TnT may be faster, but Glide has far better image quality then D3D at the time.
A week or so ago, I installed the rig in my signature, and installed Final Final Fantasy 7 on windows98, and also UT99, Carmageddon2 and Diablo2.
Now, Diablo2, Carma2 and UT99 all support Glide and all look better on my V2 SLI then on the Geforce2 Pro. It even looks better then when I play it on my newest machine, which has a 4890 Toxic.
And as for Final Fantasy, it runs on D3D, but that also looks a lot better on the Voodoo2 SLI then the Geforce2 Pro.
If you want I can make screenshots and post, but Voodoo2 is way better image quality then TnT2