I just bought one used two days ago.
I had in the past (a very past) the original ARP Odissey and an Avatar (the guitar version of the Odissey). They sounded quite differenti, and now I understand why: two different version of the filter. A friend of mine still have the all black one with coloured sliders, which Is again different, maybe two poles filter?
Anyway the Behringer sounds good but a bit differenti too.
My ARP had a ring modulator I used to build fabolous bell like sounds: metallic, full of harmonics.
The kind of sound you can hear on Japan Tin Drum or Oil on Canvas albums.
Until now I couldn't recreate this sound.
Neither the Avatar did. Just my ARP Odissey I sold for little Money :(