I just received my 23L (6 gallon) PET carboy made by the Vintage shop and I'm really impressed. I ordered it from Brewmaster's warehouse and remember it being maybe a buck or two cheaper than a 6 gallon better bottle. First off it has no horizontal ribs for sediment to settle, which is not that big of a deal. I always just gave by better bottles a bit of a spank and it would fall down. The REAL advantage I think is the thicker bottom. it is really solid and flatter that the better bottle. I hate the way the bottom goes in and out with a full better bottle, sucking vodka in my brew when I move it to cold crash or rack. I have not used it yet but I would like to this weekend if my water hose thaws out.
the Vintage shop website has some more info: LINK
Has anybody been using these? I just cracked the last of my glass carboys and might get another one of these. They appear to have all the advantages of the better bottle ( light weight, safety) and a glass carboy ( rigid, no ribs/smooth sides, very clear)
they also make 3 and 5 gallon versions.