best adapter period
its virtually lag free and works with dance pads with leds

Works on PS3
I got my Dreamcast and Gamecube controller to work nicely on the PS3, although the layout of the buttons is inverted, which is a minor hassle.

The Trio Linker Plus
This is the best USB adapter I have ever used. I converted PS2 controllers and a IIDX controller.

The PS2 controllers worked perfectly with OS X and Windows out of the box. The IIDX controller did not originally, but I installed the official drivers from their website and now it works perfectly too.

This much better then the laggy beast that I had from RedOctane before.

No title
It's a nice converter, but I can't seem to set it up to use the D-Pad properly. It either is used as an analog stick or it can be used by itself but stops the analog sticks (and triggers) from working while it is being used.

TrioLinker
This thing works great with most of the games I play. The only issues I have is use my gcn controller, I seem to have some problems with the analog for some games but other that that it's excellent product. For PS2 controller, make sure you turn analog on by hitting that button in the middle between the two analog sticks. I was wondering why analog didn't work until I hit that button.

Overall it is an excellent product. I would definitely recommend this converter for anyone that wants to add more console feel to their pc gaming.