ProjectM
I have issues with the expansion packs - but not the legacy packs. Despite that, I wouldn't hessitate to recommend this synth to anyone! It's ease of use and versatility is awesome! The first 4 hours I had it I programmed 30-something patches that I am really happy with, stored them easy and recall them easy. And it sound even better than Rapture and DimPro in my ears
I hate problematic releases as much (or more) than the next person, but I'm glad I went ahead with RP. I wasn't having specific problems, but performance has improved noticeably where I've replaced DimPro instances with RP using the DP legacy program.
Without seeing under the hood, it's difficult to say what's being dealt with in terms of complexity, but I darn sure wish things were all-around tidier when released. That goes for RapPro and S-Plat alike.