They ARE shit. We have one (secondary TV though) and it's had problems from day 1. They response time from the remote to the tv has been slow since day 1, and more recently, the apps crash without warning and the lagging has started. Lagging has nothing to do with our internet connection though. We even found out recently that the TV does not even update it's own firmware automatically... you need to actually log a ticket with them, and they'll send you the new firmware (via dropbox) and you download it and manually install it on the TV. In fact the only reason we got that is because the Mrs wanted a Google TV.
Their customer service is also shit. They said the reason these problems were had with the TV is because of our internet connection (which wasn't the case) and they completely ignored the apps crashing and slow response time from the remote.
Now they have sent a new motherboard from Melbourne to a TV repair company here to change the motherboard. FFS I've had enough of it.
If I listed to the Boost from day one I wouldn't be in this mess. It's my own fault, and
@Blue_boost was correct.