I’ve had the Legacy collection for a few months now. There’s several things I like about it, like the “hidden” adjustments in the software that make the range of sounds even greater than the original MS-20 (which I played happily for years).
The keys on the replica are motion-sensistive (!), and certain settings are polyphonic (!!), two things I would love to have had in the original unit. The ability to use sounds from the other two synths, controlled from the MS-20 replica, in the suite at the same time, is a real plus.
My one misgiving is the computer hardware power necessary to shave the latency down to an acceptable level. The “recommended” PC hardware which Korg has enumerated in the manual, and which I’ve exceeded narrowly, has a latency of approximately 4/10 of a second. That’s deadly if you’re trying to play the note on time.
I’ve got an option of trying this software on an iMac, which may perform better in the latency department. I’ll write back here with the results if y’all are interested.