Anyone had experience with Interpro in Thornbury?

I've never used them myself, but have heard mixed reviews on their work.

I'm looking to get a stage 2 set up done on my cossie and they are literally 5 minutes away from me so would be dead handy, but I'd like a couple of proper opinions rather than pub talk.

If not, is there anywhere else decent around Bristol with 4wd rollers?