These are pretty great. I had one for a while when I was still using lots of midi gear. Incredibly flexible, if not always the most intuitive. The track lengths, time signatures, and speeds are all independent and it can run 64 tracks at once. Talk about polyrhythmic/polyphasic! Also great midi effects.
Unfortunately, with only one CV/gate out once I got heavily into modular it just wasn't right. I replaced it with Ansible, WW, and Earthsea to use with the recent grid that I already had and couldn't be happier.