We're looking to move away from PFSense and CARP to a pair of SonicWall NSA 2400¹ configured in Active/Passive for High Availability.

I've never dealt with SonicWall before, so is there anything I should know that their sales guy won't tell me?

I'm aware that they had an issue with a lot of their devices shutting down connectivity because of a licensing fault, and they have an overtly complex management GUI (on the older devices at least), but are there any other big "gotchas" that I need to be aware of before committing a not insubstantial amount of money towards these devices?

_{¹If you're outside the US, the SonicWall global sites suck balls. Use the US site for all your product research, and then use your local site when you're after local information.}