i have the cheap ebay ones!
but to say the least they have held up great! and my friends dad said they are well machined!
also to add i never had much of any background with spacers, so when i first threw them on, i drove 1200 miles to mammoth and back. and did lots of offroading when i was there. i never thought once of checking them. and then 4000 miles after that i did a tire rotation and the suckers were tight as hell.
i never torqued them or added locktight! yikes lol
maybe next tire rotation i will pick some locktight for the the heck of it
and idk if its bad or not, but i put washers behind the spacer to help the push the wheel out a little farther.. i hope thats not bad?