Has anybody dealt with them and what are your thoughts?

What do you need doing?

TBH Id stick to an established garage that comes recommended.

Hi, those guys haven't been open long but i believe they do class 7 MOT's so we shall be giving them a try soon.
Everyone deserves a chance, seems a pretty clean garage.

The name is a bit offputting to me. What's "xtreme" about them?

Sometimes a name is just to get people to remember a place so I wouldn't worry about that just try it or go in and see work they are doing

Just typed there name in Facebook and they have a page on there you could see what other people have written