When I had them, I loved them. Never had any issues with the threads on the studs wearing. I'm back to lugs now that I'm not tracking my E90. I did buy the extended lugs from Turner
so I can continue to use my spacers.
One weird thing I've found is some tire shops are reticent to work on cars with studs, stating liability concerns. Anytime I had new tires mounted, I had to put the car up on jack stands in the garage and drive the truck over with the wheels & new tires to get them swapped. PITA.