"Just because a lemon is $1 in one place doesnt make it a better lemon than a 10 cent lemon from somewhere else".
yes this is all true.
when I first introduced the carto tank to you DIYers it had brass end caps,, then a nice alum. version but because not everyone could cut inside O ring grooves the rubber washers type end caps got popular. As the DIY tanks began to catch on a lot of people complained about the rubber. Then they complained about the alum. not being safe, then they complained about the tubes cracking. So to address all of the complainers. the top of the line tanks are now made with Surgical stainless steel end caps, Viton rubber O rings and have double thick wall bullet proof Lexan for the tube (or even heavily engraved stainless steel for the tube). So of course they will cost a lot more than the DIY type. ($50.00), Do they work better? NO, I like to think they will last a lot longer and they look really nice. Funny thing back then the MAP tank was the hottest thing going and my carto tank design was scoffed at. It took 8 to 10 months for them to catch on but now everyone has a different version. And the really funny thing is now there are so many different ones on the market that I have people try to explain to me how they work, and each one claiming that they were the one to have invented it. It is nice to see that they have gotten so popular that there is even a dedicated thread in the modder's den. Now it took a long time to get permission to even talk about them on the open forum (and of course the Admin won't let me talk about a given brand or vendor) but I understand that I can discuss the how to's and why for's, So if you are a DIYer ,,, go for it, build one yourself, If you are the health and safety type buy a top of the line one. Or if you just want a tough one to throw around at work, get a good one. Have it gold plated and engraved to show off a bit, think of it as Art. One way or another It's all good, there will be something for every type vaper.