[Q] Defy+: What is lost by changing from the official (rooted) ROM to a custom one?

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http://forum.xda-developers.com – I have a rooted Defy+, from which I already removed all the cruft I don't need. I am mostly happy with the phone, but there are a few quirks which are making me consider changing to a custom ROM to get a more recent Android version (rather than Gingerbread, 2.3.6). However, I am concerned about the drawbacks of doing so. For instance, one of my brothers runs a custom ROM as well, and he suffers from random reboots around twice a week. If I want the best reliability, are the official ROMs my only choice? Or do some of the custom ROMs manage uptime in the range of weeks/months? Also, is th (HowTos)