I have mine connected wirelessly and I haven't had any issues so far, however 1.5 did require me to redo the wireless setup (actually seems better now). I originally had to update to 1.32 just to get the wireless to work.
Tried 1.5 yesterday and it fixed the crappy appearance of PS2 games on mine, however it does take a few seconds of screen fuzz (snow) when it switches resolution (via HDMI). I watched Kingdom of Heaven BD and had no issues at all.