What model has the most movement?

I think the Eupho offers the most movement but I can't be sure since I don't own one (yet). It's considered an advanced model, though, so you might be better off with the Helix.

The Eupho probably has the most movement, but if you want to try something that moves even more, try the Peridise. It's so much smaller, and for me at least, starts involuntary contractions faster than any other toy (and I have a pretty good selection).

Progasm Jr because of the surface. If they made a eupho ice the model would have insane movement. Wish they would do it! Wish all the models came in ice.

I opt for Eupho. It's slender body and tip allows it to 'rattle about' laterally more than other Aneros toys. The advanced design stem easily slides through the anus and that frees it up longitudinally.

I have the Eupho-classic rather than the Eupho-syn. My guess would be that the '-syn' model with a well matched lube would offer even more action.

I vote for the Eupho too. It seems to have more longitudinal "play" than my Helix.