I don't regret buying; I've been happily using it for many months while watching the rants and raves. The new OS should be like getting a new keyboard.
My friend Semilive also has an Audya. He is liking it more every time he plays it.
He would probably have opted for the 61-note model if it had been available.
I may consider getting the module at some point, simply because I could use a very light-touch controller to save wear and tear on my arthritic wrist. Probably not though, because I do like to have everything in one package.
DonM