To each his own. I haven't had to do a thing to my phone in about 2 months.
Some people complain about the volume....some people block the speaker hole with their finger, or if you open the back, I have seen phone's with more pocket lint than all my pants have combined.
If you are still using the x10 version of Android 2.1, with Timescape and Mediascape and face recognition software, I have no doubts that the phone seems laggy. Only once you have removed the extras does the phone get a little better.
And if you want it to further improve, go all out. Install Busybox, download and install xRecovery, and then load a custom ROM that has been designed to be as fast and smooth as the phone can be....tweaked to near perfection.
But going through those steps can be frustrating and confusing to a lot of people....and sometimes it doesn't go as smoothly as you hope....but it never breaks the phone.
If you ever have a day to mess around with it....I highly suggest it to everyone.