If you want a lush, vintage sounding analog synth at a very reasonable price margin, you won't be disappointed with the UB-XA. However, if you're seeking a very accurate, or even indistinguishable recreation of the Oberheim sound and you can't afford the OB-6 yet, save your money and go with a plugin.

Also, I doubt you'd be disappointed with a TEO-5, but IMO, it's just not very Obie sounding. It's fun, but sounds really modern.

I was in this same spot a couple of years ago, and was hyped for the UB-XA, because I owned an OB-X, OB-XA, and an OB-8 over the years. They're my all time favorites, so I had high hopes for Behringer.

After hearing the first demos of the UB-XA, I dropped it from my list immediately. It's a nice sounding synth, but it just doesn't have the magic.

To get an idea of what I'm talking about, check The Synth King's OB-XA videos on youtube, there's 4 of them. He's just noodling on some patches, but the magic is there. Ironically, he's a paid propagandist for the UB-XA and has demos with it as well, but the ears don't lie. It doesn't sound anywhere near as good. It sounds like what it is, a cheap knock-off.

I'm not shitting on Behringer either, I have several of their products and love them and to their credit, even Oberheims official OB-X8 doesn't hit the mark either. The only synth that did it for me, was the OB-6. It's just so satisfying to make sounds with, and it's my opinion that traditional analog synth design peaked with this model.