Lahrok, Willowley and I bought this one. It's great: http://www.starwest-botanicals.com/product/ezy-care-glass-eye-wash.html
I've heard of people saying they can't get a tight fit. I don't have that problem myself. I think its a matter of positioning it correctly, its something you've got to play around with since they only come in one size. ;)
Well that clears that up pretty nicely lol!
I thought all eyecups were the same size, meaning you couldn't get like a sm, med, or lg but it makes sense that different manufacturers make different sizes just like with everything else.
So that's three of us that are happy with the Starwest eyecup so I think we got us a WINNER.