really impressed with the staff at Sigma service center.

Called the other day regarding some technical question on my newly acquired 150mm macro about the use of manual focusing while on AF. [sorry, lazy to check manual]. Enquired about whether can use it similar to my Nikon 105 AF/M feature.
Kevin was very helpful and give answer on the spot.

He even offer to try out on one at their side the following monday to confirm and asked me to called at 9.30 monday morning.
Forgot to call and that very afternoon, he promptly called me to give the reassurance that it is feasible.

Well done, Kevin.