I've installed a bunch of these recently too; several domes, several bullets and 1 of the HD Pro cameras.
I installed the NVR software under a Ubuntu VM, running as a Hyper-V server guest on an old HP 1U G6.
Love the Unifi Video software and the very new (released only a few days ago) Android App.
Generally, I would choose them over other cameras I've seen/tried (if only for the great software interface), but a few observations ...
They record sound: You can (to some extent) disable this by tuning the mic level down, but it can still be overridden. You should check local legislation on this; in some areas it may be illegal to record sound/conversations. It should be possible to physically remove the mic though.
The Pro camera, while decent quality, is not as good or as high resolution as TrendNet's offering, which is less than half the price.
The regular 'outdoor' bullet cameras are not fully waterproof I believe (I think the Pro unit is though).
You can't use them as a stand-alone IP camera (without an NVR).
The web interface only works properly in Chrome/Chromium browsers.
As already mentioned: No PTZ cameras available (yet).
Edit: Oh, one I forgot to mention: Motion triggering. Unless you modify the schedule accordingly, when the IR LEDs turn on/off, they trigger a recording/alert, every time.
I'm sure there were some other minor niggles too ... can't remember what they were right now. These aren't criticisms though, and I suspect most of these issues will be addressed over time. Generally, I think they're great.