Let me know how you like it, Acu, it is quite an attractive phone. I definitely hear you regarding OS updates. I am currently running a modified T-Mobile leak of 4.1 on my SGS3 and I have been lucky in the sense that I haven't encountered the GPS lock issue, and larger issues but I have encountered the power button reboot when charging. (most likely kernel related) The last ROM I was on (Synergy) was fantastic and added a lot of functionality but there were still the occasional hiccups here and there. I love tinkering with my phone and am a flashaholic but overall I have always been highly impressed with how tightly knit and polished iOS is. One of the reasons I cannot see myself moving away from the iPad. It feels like you complain about it as much as people discuss it. Just ignore it and don't bother wasting any energy commenting on it because this is a tech oriented forum and people like discussing all forms of tech.
Have to say I'm very happy with my Galaxy Nexus with stock Jellybean 4.1.1 at the moment, I've only ever had one crash on it that needed a restart so far, and the OS itself (although still arguably not quite as polished as iOS) is pretty damn smooth and definitely an improvement over ICS in the UI. I'll probably keep the phone until the next Android update (which I should get, it is a Nexus after all, and the old Nexus S still got JB too!) and see how it runs, but I like the phone itself, it's slim, the 720p screen is nice, and it just feels good to use.