Question : Watchguard XTM 505 or FIREBOX X550E - is it too soon to jump?

I am ready to buy Watchguard (moving away from Cisco ASA) but am not sure if the new STM series is mature enough to jump onboard. Has it been out long enough? Is it stable? Any happy or unhappy users out there? Thanks!

Answer : Watchguard XTM 505 or FIREBOX X550E - is it too soon to jump?

I've used both Sonicwall and Watchguard.  Although they roughly do the same things, I prefer the Sonicwall interface to the Watchguard.  The Watchguard requires the System Manager installed on a physical workstation in order to implement and configure the appliance.  The Sonicwall has a web interface and everything is contained on the appliance.