I got tired of waiting for even the smallest of fixes for the several bugs on the MS OS 3. I could not even get the bug that crashed the MP3 (internal) player fixed. To be honest had only JUST that one been done, and the performance setup bug sorted, I would have kept it.
I got tired of empty promises to fix. Nothing ever happened so in the end I gave up in exasperation.
The arranger side was never really a big thing with me. Yes it was very flaky, but I was happy enough to not use it live. It would not have worked live anyway. Back then the arranger section (even using LS) was not "live-friendly"