I second that opinion
jtracc!
These rock! I use the ET-S Glass BDC with my iTaste VV battery mod and I use the Aspire BDC Vivi Nova Pyrex Tank Stainless with my iTaste SVD mod.
Both work VERY WELL! No gurgles, no leaks, warm vape, great TH, etc.
I followed Eric's advice from DiscountVapers.com and washed the new units thoroughly (excluding coil head) prior to first use to eliminate any factory production residue, film, and such. I filled them up and let them sit for a few minutes then did very gentle pulls on them to ensure the coil head was filled with juice prior to actually powering them up. This is especially crucial when using thick juices. Since the two holes are small and there is a liner in front of those holes, it's imperative that one lets the coil head get saturated with juice prior to vaping.
I believe those that are complaining about them are in too much of a hurry to use them, don't clean the unit first and don't allow the juice to soak into the coil head assembly.
Now for those those who say these leak. ALL tanks leak to some degree or another I have discovered. Usually it's just a little bit between the 510 connection and the battery connection. Now I have noticed that in cold weather, if you're taking the units outside and such that the tanks get cold, then when going back indoors the leaking occurs. This I believe is because the juice is expanding in the tank along with the metal unit itself. A cure I tried out is to take the tank off the battery mod and any extra tanks I have that I carry around in my carry bag. I set them upside down so the bottom of the tank is up, so as they warm up and slightly expand no juice is forced through the coils. Once they've reached room temperature they're good to go, no leaks or issues then.
TIP: Green floral foam is a handy item to use to stick your tanks into upside down. It's used for flower arranging and you can get it at any B&M florist store. They'll also cut it to the size you need. Very cheap and it conforms exactly to the shape of the unit. Now it's not the most aesthetically pleasing item to look at, but for the purpose I use it for it works great. Then the block of foam goes into the desk drawer.