front upper control arms

the after market ones for adjusting, they help with the camber....do they ever come loose or break over time even if not abused. i would hate to have them on and i hit a bump and the ball joint slides over giving me asscrap camber. anybody know or have used these?
and if i have 15" slipstreams and lowerd with 1 inch space between the tire and the wheel well. do i needs them?
and if i have 15" slipstreams and lowerd with 1 inch space between the tire and the wheel well. do i needs them?
