I would second that recommendation. To date, I have bought a Diamond Monster 3D 4MB, a Diamond Monster 3D II 8MB, and two STB V2-1000 12MB cards.
The Diamond Monster 3D II 8MB Voodoo2 card wasn't working properly when I first got it off of Ebay, but it turns out it was the edge pins on the top of the center chip that was bent over and touching its neighbor. A strong knife edge and some VERY steady hands later and those pins are now roughly strait and not touching, then I stuck the card on a shelf for about 4 months. I tried sticking it into a computer so I could record the results of the glitches on-screen and found out there were no glitches anymore - the card worked exactly as it should.
The STB V2-1000 12MB cards are identical, yet wouldn't do SLI with the drivers on the included CD-ROM which was the original driver disc that came with the cards in the first place, nor with the official Voodoo2 drivers from the web. It wasn't until the nice folks HERE on Vogons pointed out the FastVoodoo2 drivers that I got SLI to work properly - so now I can game in glorious 1024x768 GLIDE. This will be very helpful indeed, as I plan to start streaming retro games on Twitch on my channel.
If anyone is actually interested, my Twitch name is "BeardedRetroGuy".