Fluxes are not glued, you can just take the tube off by wiggling it. Super easy to clean. And I've never had one leak from a bottom seal. For that matter, with a drip tip on, I've never had any leaks from the top either, or condensation getting into my mouth. (sorry, Rob). If you don't use a drip tip, though, you might get condensation in your mouth once in a while. I have.
Visions are glued, so don't try to take the tube off. They can be cleaned with the tube on - tube doesn't melt if you dry burn, so it's no big deal. Just takes longer to dry. You can also fish the wicks out to clean them. I have had a couple of Visions leak slowly through the bottom seals, but, by far, most of them don't. Visions wick a bit better than Fluxes, imo, and make more vapor. You can use an 801 drip tip on the Regulars - I like it better than the whistle tip that comes with it. But that's a matter of taste.
The matter of bubble and gurgling in Visions is solved easily enough if you don't let the air-tight seal form between the mouthpiece and the tube. Just queeze the tube when you put the mouthpiece in, so that it takes on a slightly oval shape and leave slight gaps between it, and the mouthpiece. Then let go when the mouthpiece is in place. There are also several mods going around that take care of that. There is a thread here someplace...
Anyway, both Visions and Fluxes are great, way better than regular CE2s. Love them both. And tubes really are unbreakable. I once stepped on one (and I'm pretty hefty) to no effect whatsoever.
