I personally have never used one, all my smoking has been on old school smokers with the side firebox. Tastewise I don't see an issue, and as for temp control and whatnot, its pretty easy to maintain temp no matter what you're using, just takes a little TLC. The thing that I'd be worried about is mechanical breakdown, something that's never an issue with the old school types, but then again I have zero experience with them.
Price is fucking killer though for sure.