The biggest problem with complex electronics is "infant mortality" -- failure within the first hours of use. Since that projector is well past that point, and the one degrading part, the lamp, would be replaced (insist on a real Epson lamp!), if the optics look clean (inspect the air filter for too-long-between changes) I would take the deal. Buy two fresh air fiters to alternate, and clean them with 90% rubbing alchohol when removed. For typical home environments you should get about 6 months on a filter for 1000 lamp hours per year.
The above are my opinions only (excepting infant mortality, which is well known in electronics manufacturing). YMMV.