No, not dodgy.
Just instead of an insurance base company who will just fix the visual damage, this company will make sure everything around the damage is fixes.
Like if you had a front on, and the radiator got punctured, they will fit new hoses, probably a new pump as well in case shit got in and it dried up during repair.
If you damage your quarter panel, they will make sure the inner wheel arches are perfect and not just covered by the new quarter panel, and that the whole front end of the car is then properly aligned.
At the end of the day, it's the person who hit you's fault, so you should make sure your car is as good as it was before the damage, not just fixed.
BASS OUT