I didn't think it was that quick on updates......generally about 5-6 weeks
Update-06.....23-Nov-2014
Update-06E....9-Jan-2015 (emergency infosvr fix)
Update-07.....20-Jan-2015
Update-08.....10-Mar-2015 (Asus security fixes)
Update-09.....17-Mar-2015 (mainly because I accidentally broke DDNS adding custom scripting)
As far as factory resets go, I actually take steps to avoid them with some extra code when needed. My goal is you can move from any fork version to any other without a reset (either up or down).
That being said, when Update-10 is available after the OpenSSL update is released, for the first time I'm going to recommend that everyone consider updating. Starting with Update-09, I think I really reduced the possibility of hitting a lot of the single occurrence/unexplained problems which have been reported in the past.....no internet access on a reboot, all web requests being redirected to the router, the router ip has changed message and so forth. We'll see.....