I've done it.  It made my SS5 perform like an Ultra 2.  No, it didn't,
really.  It was faster, but in my case the need was to use a disk array that
had useful nuggets from the SS20.

It is a good point though.

> The reason I ask is that I do get fairly decent speed out of my little
> SS5, and I've seen some dirt cheap prices on used wide controllers,
> but didn't get them because I figure the machine is too slow to make
> use of them.