Update.
I had four pieces w/ RezBlock for a couple of days. Three, I used for testing/getting my head bashed in dabs. The DR collects a lot of Pooh. Its the nature of the design, it blows water all the way up the can. When I tip the piece, to coat the MP... big Pooh likes to stick up there. By day two, however... it had broken up. Though, if I had been constantly doing dabs, it most certainly would have collected. It rinsed right out.
The Lattice bubbler, nothing really has a chance to collect. The perc/RezBlock breaks everything up. Its just a superior piece. The best, in my collection, at this point. You also have to take into account its the highest water volume piece of them.
The VB Mini w/ the SSFG AC collects, but that's the nature of inlines. Plus, its all mini pieces.
For vapor, I was using my new HVY tube w/ Mike's (OGB) awesome new gridded 15-cut, closed-end DS. Wow, does RezBlock work AWESOME in this piece. Distilled water, RezBlock this rig, just does not collect and it rinses to sparkle. So happy, I grabbed this little sucker. Its 5mm, but its that notorious HVY/MiO glass glob joint. I don't like the sound it makes, when you stick your finger in there. Sounds like the glass might be significantly thinner at the bulge. Would like some calipers. Its beefy every place else... so it might just be a trick of sound. When I stick my pinky all the way in, it feels substantial and strong.
I'm getting one of those coffee cup/candle warmer deals, because the bottom of the HVY tube, is flush with the base. Though, it may be overkill, since it doesn't collect anyway. I do like hitting off the warmer water.