Hi David,
The dob is a custom-made shell (?) using GSO mirrors and mirror cells. The mirror surfaces are in good shape (recently cleaned the primary), however, a bit dusty. The overall condition is usable, but not great.
I would offer for you to outright buy it, but someone has already bid. You’re basically buying the mirrors/telrad and collimator and you’re getting a free usable but not amazing shell, and the price reflects that.
Happy to answer any other questions.