Okay, I now too have had a horror story about bootloops and being stuck at the bootscreen. Enough with LS8 - back to LSJ and now rock solid again with the mods I like.
When on LS8, I was busy charging my phone and then installed an app. The app froze the phone and I restarted by pressing the powerbutton for a couple of seconds - then the phone was stuck at the bootscreen. So I thought, get into recovery and flash NeatROM Lite 4.2 again and the problem will be solved. No luck. So I decided to restore a nand backup (NeatROM Lite 4.0 (LSJ) with Siyah) and I got it to boot, but also a weird error of some process that has to stop. I flashed NeatROM Lite 4.0 over the backup with the same problem. Went into recovery and wiped cache and dalvik cache - no joy. With my sense of humour long gone, I managed to flash the original leaked LSJ with mobile Odin and the phone went into bootloop. Went into recovery and did a factory reset and restored a nand backup. Bootloop! Factory resetted again and flashed NeatROM Lite 4.0 - boot-freakin-loop! Factory resetted again and restored an older nand backup (version of LSJ) - running like a rolex! Restored all user data with TB and no hassles so far.
2 things worth remembering:
1. Make Nand backups often
2. Don't reboot your S2 while charging if you are on LS8. I read that there are more people with the same issue.
I should have listened to myself a couple of weeks ago when I said I will wait for a German or Dutch version of JB. Now I will!