Used suspension parts

What is the lifespan of shocks, springs, struts, coilovers? I know a few guys who are sellings some used eibach pro kits and I am wondering if I buy them will I run into problems, they were used for about 2 years.

It's hard to say exactly, at least 40,000 miles. I personally would not bother with any used springs, struts, or true coilovers.

www.tirerack.com H&R springs $150