You will no loose any configs... only if you upgrade from 2.8.X to 2.9.X you have to check some configs, export them, and then put it again on MT ...I always like to use latest software. A lot of ppl are experiencing problems updateing their routers without loosing configs. This is bad. MT Team: keep up the good work... fix those problems, add those features...
Why worry about support if all works :Dwhy? first - you cant get support or help from forums :)I am using 2.7 and I am happy :)
Why fix if nothing is broken...