Alot of folks report 50-100000 miles no problems street /track, and thats with XA's as well as BC coilovers. Alot of those with G8's say the same and they have more time and miles in to.But you can have a bad set, it happens. I had konis blow in the rear over a big dip on the freeway at speed, but car was lowered and bump stop was cut down(per experts advise
) AFter that and replacing stops, no problems.
Alos I hear running the settings to high all the time will wear them sooner, but not blow them I dont think.
As to quality, other then Pfadt, all are made in Asia somewhere. In my industry and others, quality can be up or down and not consistant
#1 car 2010 Black 2LTRS 1/28/10-10/15/11, 17900 miles
#2 car 2012 Red 2SSRS 10/15/11-
Mods: Outlaw Axelback & J Pipes/Heritage&Stillen Grill/Halltech CAI/Apex Scoop,Washer Bottle/OEM Strut Tower Brace/VMax T/B/ G.M. Blade Spoiler/SLP Splitter/TSW Bathurst wheels & Michelin Super Sport tires/JBA Shorty Headers,HiFlow cats & tune/Remote Clutch resovoir/ Pedders Supercar coilovers and Pedders 27mm/32mm ZL1 Spec sway bars / Whiteline craddle Inserts & Upper rear arm bushes/ 416/414 RW HP/TQ