Don't do it unless you want to replace it all in 10,000 miles. I don't have any experience with this outfit specifically, but have made the mistake of buying cheap parts because they were cheap and had to replace them because they failed far sooner than they should have. If you value your life, your family and your time, suspension bits are not something you want to skimp on.

One thing to remember is that the eBay feedback is on the purchase experience ONLY, not on the longevity of the parts the buyers got. Everybody is going to be happy with shiny new parts that get delivered promptly at low cost, but where can those same people who find those parts failing 6 months later rate their satisfaction? Not on eBay. Check around on sites like BimmerBoard and BimmerForums to gauge people's satisfaction with these eBay deals; you'll find plenty.

Like the others said, find out specifically what's clunking and spend your money on quality parts (Meyle or Lemfoerder) instead.

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2001 X5 Sport 3.0/5-speed
1998 318ti/5-speed
1988 735i/5-speed
1984 528e/5-speed (soon to be M20B25-powered 525i!)