I HAVEN'T rooted my Orange branded phone believe it or not and my observations are as follows:
The memory issue used to be a big problem for me but I didn't have the balls nor the knowledge to root so that forced me into REALLY understanding and considering what I used my phone for.
I realised that many of the Apps I wanted were infact just pure novelty, such as Goggles and Layar. I didn't use my phone half as much as I thought.
Now my "housekeeping" is impeccable
Once in a while I clear Caches and Data and I run with about 23Mb free.
I do not have the latest updates installed from You Tube, Maps and Adobe Flash. They are massive files and you tube and maps work just fine without them. As for Adobe, my web browsing doesn't seem to be ruined or impared running Dolphin HD.
I don't have any games installed as I found the screen too small to really enjoy anything interesting, Angry Birds held me for a while but that soon went. Most of the other games are awkward at best to play because your finger/thumb is covering the screen lol
Most of the buttons on the phone are now needing to be pressed either quite hard or multiple times. This is becoming the main reason to change the phone, also the USB port is also becoming loose with care being needed when placing the phone down when on charge to ensure that a connection is maintained.
As a workhorse though, I find it difficult to critisize. It handled admin duties very well, running both my work email account and gmail account without fault and the sync with Google to cover Docs and Calender were not a problem.
The only noticeable thing I can really complain about is that with age, the phone has become laggy as more and more crap ends up in various directories. It could do with a factory reset I suspect but I can't be arsed to set up the limited personal touches that I have again. Things like customised Folder Icons via Folder Organiser and the like
Overall, an outstanding piece of kit but the game has moved on and my next device will need a bigger screen. I might even be tempted away from HTC
But not Android
Hope this helped someone lol