I like the puck mouse too. Still use a few on occasion actually too. As for whether or not the Rev. A iMac is rare, I doubt it. Pretty sure those things sold REALLY well back in 98, so calling it rare would be a bit of a stretch. Might be worth something to a collector someday if kept it good working condition with all the accessories. Right now its probably not worth any more than any other G3 iMac. Too old to be particularly useful, but too recent to be truly collectable.