Well all I know is that I am able to play World of Warcraft on my laptop while tethered to my Pro...with absolutley no difference at all in terms of playability or lag. It runs smooth as silk. I can also run teamspeak/ventrillo while playing wow and still have little/no issues (the only problem is if someone texts me, the data connection drops for a second, and Wow will freeze, then unlock itself after about 30 seconds)
Now to me...thats effin' awesome...no speedtests are needed to prove the Pro's tethering abilities to me.
I love this friggin phone.