I sucked it up and got the HTC leak on Monday. I have a horrible history with doing such things on my own (I actually caused a fire on my 1st Droid X), so I was apprehensive at best. I followed the directions exactly and ICS is up and running.
I like the little tweaks here and there. It seems like they took some features from other home launchers and made it work. I can't tell yet about the battery because I'm still in the process of tweaking all the settings. It DOES work better with Sense even though I had been told that there was a conflict.
So it's nice, but not earth-shattering, IMO. I have it now so the point is moot, but I could have waited for the OTA.