I know this post is old but on my TP (which I just had replaced, so it's either new or refurbished) I have tested the phone with EVDO and WiFi in my home (with and without the update - no soft reset was even needed) and I've found considerable difference.
Using MobileSpeedTest the EVDO and WiFi speeds were basically equivalent at around 1500kbs (WiFi w/o update here):
Using the WiFi w/ the update I'm hovering over 4500kbs:
