I only use OEM regulators. Last time I had a regulator actually go belly up (cable was mangled), I bought a used OEM one for ~$35 if memory serves. Always install any regulator with new clips and sliders. I use OEM window clips (the black ones) and aftermarket sliders with regulator installs. I'm also sure to do the zip tie mod to all sliders before re-installation.

Haven't had a re-failure of a repaired window following the above procedure yet. *fingers crossed*

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)