However, after living with it. I found that the more I used it, the more it annoyed me:
- the vibrator didn't always work, but would sometimes work after have the phone a shock (as was described as a fix on this forum somewhere).
- mobile data after I had been using wi-fi. The G/3G/H icon was there but when you try to use an app that needs data it just waits and eventually times out complaining about no connection. Data would come back after a reboot but that soon got tedious.
My previous phone (an Incredible S) was rock solid on gingerbread but went flaky after it's ICS update (bluetooth problems mostly) so although at first I thought perhaps I had a dodgy handset, I had been wondering if the Sensation might be better back on gingerbread.
I had looked into what was involved to downgrade but it seemed like a lot of faff (I was sim-free on hboot v1.29, S-On, HTC unlocked, Rooted) but this week-end I finally decided I'd had enough and was even thinking of selling it, but decided to try gingerbread first. After about 6 hours (!) it's back on GB.
Today is Tuesday, I reverted it on Friday so it's been running for about 3 1/2 days. So far (touch wood) neither of the earlier problems have presented themselves (and no new problems have appeared).
With the HTC overlay the difference between the ICS and GB (visually) is actually very slight IMHO, ( especially since I don't use the stock launcher anyway) and other stuff like general speed of response and battery use seems no different.
So, in summary, at the mo, I think it's the best decision I ever made about this phone. If you are getting beaten up by ICS I'd recommend giving this a thought.
[This is a repost - because I originally posted in the Sensation Q&A forum by mistake..]