I've had to dabble with almost every piece of hardware.
It's OK for what it is, basically a keypad via software interface, but as much as I like Honeywell and their hardware, I think it's the wrong way to move into an automation platform. The huge downsides, unless you're a dealer that wants to force the hand for RMR and total connect hardware and services, it's locking you into a bunch of hardware to integrate where other larger platforms are not.
To view it as what it is, a fast way for the dealer network to dabble in HA on an existing platform or do a bolt on HA installation, it'll work, but in the world I deal with, it's a one trick pony and very limited.
It's a shame that they dropped the Apex Destiny line after they purchased it, because that could've been a very nice platform to merge with the Vistas. (too bad they had chipset issues and backorders, which I think it what killed the product).