I've been looking at these on t'internet in moments of boredom, and have kind of come to the conclusion that there aren't actually that many different sorts out there. And often, the most interesting aren't in production any more. The only one that has made me lean towards the screen squinting was a thing called the
"Third Hand" (no smut, please).
I've got a EH Tube Zipper which seems pretty unique, but the rest of them are just the usual fare.
So...
1: are the majority of effects just the same gubbins in different boxes?
2: what unusual effects have you come across, if any?