After trying out fcom I have decided its not for me, I found it simple to get up and running as long as I followed the instructions carefully and while it added a huge amount of content to the game it crashed a few too many times for me and I just didnt seem to enjoy it as much as I enjoyed OOO by itself.
FCOM runs very stable for many users, indicating that CTD issue are caused by user side faults and other mods used at the same time rather. In short, FCOM isn't unstable in itself - and if it has issues it's better to report them in the release thread so they can be looked into and fixed rather than judging the mod unstable in future posts based on, in all probability, a faulty install or other mods/issues.
I use over a 100 mods too, but I never have had a crash with FCOM.
My first CTD with my current char and FCOM+ was at Lvl 8 or something - and then it was an overload CTD not connected to FCOM in particular. Blade Of Mercy played a 19 hours http://www.gamesas.com/index.php?/topic/1160601-my-new-personal-best-playtime-without-ctd/.