I had them, and didn't like them. My car didn't know what the **** it was doing when cold, and kept changing the warmer the car got.
The idea is the fuel hits the intake runner walls, which evaporate the fuel at different rates based on the temperature of the air, fuel and most importantly the runner wall itself. If you want a little more on it, read this: http://www.megamanual.com/ms2/xtau.htm
Claiming you have no issues is risky business. You could have tip-in fueling issues, running rich/lean during engine warm up etc. Essentially things that most would put down as driveability or emissions. Things that tend to get overlooked. Without proof, which means datalogs with a calibrated WB, we're both flying blind here.
