So what's new, current Tamron build quality is suspect. Doesn't surprise me one bit so I try to make it a point not to own any modern Tamron lens, no matter how great the supposed optical quality is.
I guess if one is prepared to fork out more than S$1K plus for a lens, one better make sure it will last and not have niggling quality issues.
The risk of sudden and complete SDM failure was a bigger worry for me. Maybe the actual percentage is not high, but if ever it happens to me especially out of warranty I would be very very pissed. :angry: