I used the stock firmware for a few days on my Telestar Digibit R1 then went to Perexg's firmware because I can't resist a custom firmware!
Never been forced to reboot the box once. Reboots have only been to upgrade firmware or because I've needed to turn the box off for other reasons. Months of consistent uptime, watching/recording multiple channels. All 4 tuners in use etc.
It is without a doubt the best purchase I've made when it comes to DVB/Satellite equipment.