Eclipse balls: not sure they're an improvement over squeezing without them.
Crystal Egg: I wanted to suspend weights from this, but they couldn't handle even two pounds without breaking.
Kegelmaster: This is the one with springs between two plastic pieces to give you resistance as you squeeze. Its ok, but overpriced for what you get.
Jade Kegel Eggs: I just ordered these. What I liked about the Crystal Egg was that it forced me to squeeze super hard to keep it in when weight was attached. So I wanted something else like that that would let me hang as much weight as I could handle. These do that, but they're so tiny! They're the size of green grapes. The only problem with them is that I'm having a hard time attaching just enough weight. Either its too much and I can't keep the egg in for more than 2 seconds or its not enough and it stays in without squeezing. If I keep experimenting, maybe I can find the right objects to use with this. Plus I think I need to find one that's a bit bigger to start out with.
So, what have you tried, celibacysucks?