They have a demo - try it before you buy it. At the time it was released I was really impressed with the algorithm, and purchased it because it was at a major "intro discount" and we were promised (in this thread!) continued development. I have nothing but regret for my purchase. There has been ZERO support / development for years, and we are still waiting on BASIC features like tempo / BPM support, yet alone a plugin version that was teased at launch. Also this "intro sale" has been matched continuously over the years, which further adds insult to injury. And you wait - IF (and thats a big IF) they actually release another update - I bet it will be a V2 PAID update!
Bottom line: I will never, EVER buy another IRCAM product. I have learnt my lesson and will choose to support other companies, which is a real same as the underlying technology is very good IMO. Its just lacking some basic features that would actually make it useable, and though they promised to add these, it seems it was all a sales pitch, and thus they have lost my trust and future business.