Thanks...just what I needed to hear.Okay well I tethered my Evo to my 360 to test this for you, Using the paid for mobile hotspot. In a 3g area with 3-5 bars (it jumps but stays at 5 the most).
I tethered playing Halo Reach online. Played for about 3 hours or so with only one connection loss( got a phone call haha) ... But other than that there was no lag and no problems. Just make sure you tell people not to call you