I have no commercial interest in HYCO ... but have observed many boats go through the yard.
Put it another way - they never seem to be without work - so must be doing something right.
I do know of some bad incidents with them - but generally because of "clients" interference / demands. I do NOT say your friend is in that category ... as I have no idea who ...
Any company can be found to perform badly at some time or another ... no-ones perfect after all.
Funny isn't it. I've heard nothing good about Osmatech (expensive) and I had a very good job done by Hayling YC. Mind you, I live far enough away not to interfere with them....
I've had two boats treated. first one by Hayling Yacht Co, and the second one by Hayling Glass Fibre.
I would recomend HGF. Have a chat to Mike Frick on 07836- 510657