How many music consumer goods that were released in 1990 are still being produced today in their original 1990 form?  Not many.  I think the only attribute that has changed is the SR16's resolution going from 16-bit to 24-bit.  The only downside is that you have to go old-school with the programming; the SR-16 is menu-based rather than "GUI"-based.  But there is a great Alesis-produced tutorial on YouTube that's 2 hours long and teaches you the basics.