1. Are they experienced with composites in bicycles?
2. Do they know the structural loads on each part of the bike?
3. How do they determine the full extent of the damage?
4. Can they scan the bike pre and post repair with advanced ultrasound methods?
5. Do they match the material and laminate of the frame?
6. What temperature rated resin and adhesives are used?
7. Are they fully insured?
8. What warranty do they have on their work?
9. Do they have tooling to ensure correct geometry and alignment?
10. How many bikes have they repaired?
11. Do they ride?

Ok that is 11 questions but the last one is really important.

A good answer is yes, on their own designed and built frames.