is there any reason to wait for the OTA update instead of installing this?
I think the answer is Yes - at least in my opinion.
Eventually this year we will get the official ICS from Verizon/HTC.
We won't get any more updates from Verizon for at least a year - and maybe after the rezound is no longer produced, never another update.
This official ICS update from Verizon/HTC will soon become the "baseline" - it will become a requirement for every ROM.
So, this will become something
everyone will want to make a nandroid backup to take a snapshot before ROMing.
Every ROM will
only be compatible with the "firmware" that is installed by the Verizon/HTC official ICS update.
Verizon ICS will become the required starting point for every ROM.
Soon developers and others will be sick of helping people who aren't S-off to do their more complicated ROM installs, and those with S-ON will be left to figure out what to do on their own. I already see this in the pokemon ROM discussions that the majority of the posts are for S-ON people who can't figure out how to do the more complicated S-ON ROM install.
The future requirements will be:
You want to ROM - then you must be Htcdev unlocked, rooted, then S-off, and be on the official Verizon/HTC ICS.
You must demand an explanation of exactly what you will need to do to "UNDO" every change you make to your Rezound. If there is no way back - don't do it. If it sounds complicated - don't do it. If it sounds like a pain - don't do it.
I have taken this approach with every change:
Htcdev unlocked - and know how to relock it.
rooted - know how to unroot.
S-OFF - know you to S-ON.
jBear hboot - have the stock hboot handy, and know how to install it.
If you install any of the ICS Leaks - yes, if you have S-OFF you can go back to GB via a RUU exe file, and then restore your GB nandroid backup with all your settings and applications. Then you will be ready for the official Verizon/HTC ICS update. Is it fast easy and a fun thing to do? No.
My two cents,
Howard