Half Price Canon EF 70-200mm f2.8 L IS USM lens? What's the catch?

Did I get a workhorse lens at a great price, or does this lens truly have condensation? The venerable Canon zoom L lens gets unboxed from Adorama.com. This example is the first generation of the 70-200mm f2.8 with Image Stabilization. The lens debuted in 2001 as a follow-up to the non-IS version that came out in 1995.