I think it depends highly on your usage pattern. Most people don't seem to have any problems but then most people don't use bluetooth that often. I'm also on HellKat (01/30 release) and bluetooth crashes regularly. I keep my Pebble connected 24/7 and bluetooth will crash every 1-2 days. If I use bluetooth for tethering, it will crash within minutes. In all cases, bluetooth stops responding and eventually turns itself off. I can't re-enable it until I reboot the phone.
I've tried CM 10.2 stable and 11 nightlies before trying HellKat and they all have the same problem. I think it might have to do Android moving from bluez to bluedroid stack upon JB 4.2. Bluedroid seems to have some nagging bugs (particularly on the Nexus 4) that Google hasn't solved yet. Yes, I've tried that Nexus 7 bluetooth fix floating around - no dice.
If bluetooth matters to you, my advice is to stay away from JB 4.2+ for now.