Durable, the the stand sucks, and if you're not careful they'll get really hard to move due to the contact surface getting corroded by darkroom chemicals, cleaning them is annoying but quite possible. Also the bolt in point is annoying, it causes serious issues over time due to the stress the enlarger will put on your table. I would recommend bolting the system into the wall with a bracket or something to support that god awful cantilever design they have (I'm aware most enlargers have that design, but not my bessler 45). Also the counterweight sucks if you ever have to service it, and you forget to lock down the clamp at the bottom it'll come right up and wack you at mach jesus.
As for the Enlarger? Yea as previously pointed out, Omega D stands are pretty incremental and interchangeable with eachother, I would say this might be D2?
Chipped condenser lenses are rather common for this model from my experience, A lot of these seem to have been bough for schools, city planning departments, etc and other situations where they get shit thrown at em all day and no appreciation. Also they're a bit annoying to service, but not horrible. But I will say, they're generally only rated for 75w bulbs, personally I prefer 150w bulbs, but these get real hot if you do that.
Yea I have a part-time seasonal job servicing these (if anyone knows anywhere that wants to hire me full time to do that! anything more than my current 4 hours a week would be appreciated haha)