I have had the Torque app and the OBD2 BT scanner for over two years now without any issues at all. In all fairness though, I don't use it that in depth. Works great for everything that I have used it for (data logging, checking/clearing apps, KR etc).
The first BT scanner that I got from ebay was defective though, they sent me a new one and I have been using it for over two years without any problems. Pretty easy to set-up and everything.
For $25 for the app and the scanner, I don't see how you can go wrong. Its 1000x better than most obd2 scanners for a fraction of the price.