It actually was quite a bit of a shock. After reading a lot of the online noise about it, I was expecting a box of utter nonsense. Instead, what showed up acted exactly like a 3-4 year old "Orange" from ARP's late days that I used back in the early 1980s, especially when you switched the VCF to the 4072 setting. I've tried to patch things up on it that I know that the ARP was excellent at, and all of the settings are pretty much where they should be after accounting for the shorter throw on the faders. Uli even compensated for the thermal issues in the original by venting the cabinet to keep the electronics inside more stable.
The sole annoyance is, yep, the LEDs in the controls. But you can turn them down to a point where they're not quite so eye-shatteringly-bright. I also like the balanced 1/4" outs, as they appear to ensure ZERO passage of DC offsets to the outputs; this was a long-running issue with the originals, with the "thumpy" VCAs that weren't really "thumpy", but what people were hearing was the typical ARP 2600 DC offset creeping into the output. Get rid of it, and you lose the thump. Besides, DC + amp + speaker = some pretty ugly shit. Fire, even.
Granted, you hear plenty of noise on various forums about how the B.2600 isn't "quite like" the original. I would argue that that's somewhat wrong. It acts like a NEW ARP 2600...not one that's been in use (or worse, in storage) for a few decades, and the vast majority of synthesists these days have never heard a more-or-less new ARP 2600. For that set, well, here's your chance to check that out.
However, while I think this new version of the 2600 is pretty fantastic, I will admit that I still have some very strong feelings about Uli and how he chooses to conduct his business. I would feel a lot better about owning any of Behringer's equipment if he'd learn to moderate many of the more...ah...excessive aspects of his behavior and stop the various outbursts of nastiness that he's become known for.