I've got the RBI 220 vs (and like it very much), but can't tell you anything about the older belt driven units. However, I know that there are a number of scrollers on the Scrollsaw Woodworking and Crafts site that use the 220-3. You might post your question there.
My 220 vs Ultra is a 2004 unit that I picked up brand new, in an unopened box about 3 months ago for $299. Just couldn't pass that up. Minor problem for me, but its strictly a bottom feeder. The 220 vs Ultra is still being sold brand new for $1,200 by Bushton Industries, who took over after RBI. You might try calling them to see if they can give you any info.