Welcome to the forum mate enjoy yourself but still follow the rules, Most frames do not have rear disc mounts and IMO rear disc will get in the way a bit and keep catching your rotor when side hopping and other moves like that maybe you might need a new rotor nearly every time you hit it or you can just leave it battered, i think your front is harder to hit i have never hit my front rotor and if i had rear disc it would be battered it is just IMO but it does not need as much setting up as a magura its your choice if you like sorting brakes out get a magie, if you dont like sorting brakes out and you still want your brakes to be good get a disc its your choice all the way, and i love my front hope mono trial disc with my rear magura.