Replied to your post in G4C... I've had several acoustics serviced by Steven and also by Malcolm. Steven is ok. Malcolm is a pro and I felt Malcolm's service was far better. Steven's top priority is Sinamex, so he services them first. Malcolm is more expensive but I think he takes more care with his work and I'm a repeat customer there.
I find the guy at Davis not bad also.
I've always thought that sinmaex guitar hospital specialised in acoustic guitars. never really seen them have many electrics on repair.