You already know is was made by Amp Research. It was a high end bike in the mid '90s, but as with most things, it's woefully outdated. The linkage fork, with its multitude of pivots, was known to wear out much faster than its telescoping counterparts. The performance of the primitive disc brakes allowed V-brakes to rule the roost for the next several years. The rear end, with its Horst Link, is still current, although the shock is not.
For $50, it was a steal, and I'd bet it has collector value now and well in to the future.