I think that I could write a book about how much I love this synth.
I bought it as a supplement for Behringer Odyssey. A lot of people already said that it doesn't sound like an "Odyssey Extended version". I agree with this, and thanks to those people, I didn't expect to get that. Does it take anything away from 2600? Absolutely not! 2600 is a beast!
it has a bit different sound than Odyssey, but it's still an analogue monster. They play well together too.
Oscillators are massive. Even one oscillator is good enough as the Lead synth. Two detuned saw/squares will shake the ground - instant techno leads. For real, I feel like using three synths at the same time is too much. For techno/trance anyway.
The filters are nice. With a bit of resonance sound becoming acidic, which I like a lot. A lot of resonance is good for FX but not for leads/basses in my opinion, but I'm not a fan of ladder filters. I grew up on Roland filters, and there is my preference. With all honestly, I prefer filters in Odyssey, but it's not stopping me from using 2600. Just not with lots of resonance.
Sending signals to Preamp is fun. No matter if it's 2600 itself or an external source. Distortion is massive with this one. Lots of fun.
Ok, I think that's enough for a short review.
I'm still on my discovery journey, so I can't say much more about other modules/utilities besides that they're doing their job flawlessly.
Oh, and I'm not a fan of the reverb. Not because it's digital. It's because spring reverb is not my thing. An additional reverb pedal (or Eurorack module) is recommended.
Anything about downsides? Oh yes. 2600 is the entry to the modular world no matter if you want it or not. You will start expanding 2600 with additional modules. I already got another LP/BP/HP filter (Ripples) and ADSR/LFO module. And then multiple module to trigger 2600 and Eurorack's ADSR from the sequencer. What will be next? I don't know, but surely, it's not the end. Beware! ;)