Tried BT020's over the summer, rear lasted 5,000 miles before needing replacement compared to 7,500 on average for Tourance. Whilst I can't say I had any problems with then, they didn't seem to perform as well as Tourance & I didn't have the same confidence in them.
I've gone back to a Tourance rear and the front BT020 will be getting replaced with a Tourance over the next few months.
I'll be staying with Tourance from now on, as I've never had a problem with them, they grip well in all conditions and they last pretty well.
Note - I only ever ride on road, if you venture off road I'm sure there are a lot better tyres available.