My experience with Sinn is a little mixed. I bought a 356 chronograph in 2004. The watch worked fine for a few months, then it went dead. Just wouldn't move even when manually wound. I sent it back to the AD who sent it to Sinn's service centre (can't remember where, maybe Singapore). I got the watch back about 2 months later....I wore the watch off and on for a few years, then it went dead again!!!! This time I sent it to my usual watch repair fellow, told me some parts were not assembled properly and the mainspring went bust. Repaired for about RM 200 I think. So much for German precision and quality. After a while, I traded the watch (on SCWF) for a Seiko Alpnist.
Despite the bad experience with the 356, I bought a 656 this year. I got the one on leather strap. Quite a semi-heavy watch. My daily wearer, very legible, comfortable to wear. Accuracy wise, when I first bought it, it was running pretty accurately (within COSC range, despite not having a COSC rated movement!!!), but after a few months, it began to run fast (about 10-12 sec a day). I have no problem with that. Sinn 656 is very legible, but don't count on the lume. But I notice there are small traces of rust around the rim of the back-case lately. I opened the back case and cleaned it myself. Maybe I sweat a lot......
I could be wrong, but I think there is only 1 AD in Malaysia rights? Outlets in Gardens (I bought my 656 there), Lot 10 (got my 356 there)....... I guess you should know which shop i am referring to..
My advice??.......buy and enjoy the watch, but don't expect too much.
Good luck.