There are a couple things that need to be said about Carto-Tanks, that evidently not everybody knows:
First of all, it's impossible for a Carto-Tank to perform any way- good or bad. A Carto-Tank doesn't perform, it simply holds juice, that's it. As long as the juice is compatible with the tank material (certain juices crack certain plastics) and as long as the tank doesn't leak, then it's doing it's job 100% and anything else is just aesthetics and convenience related.
When just using a cartomizer, its job is to retain juice in the filler material, transfer it to the coil, and vaporize the juice. When using a cartomizer in a Carto-Tank, it has all those same jobs, but the additional job of sucking juice from the tank into the carto (as to avoid burning due to lack of juice) and the job of making sure too much juice doesn't get into the carto, from the tank (as to avoid flooding)
The carto also takes on the responsibility of becoming a juice-tight structural element of the Carto-Tank system. Both the carto and the tank itself have a responsibility to seal well against each other. A carto that has been warped during punching will sometimes fail to seal against the tank's endcaps, and will leak juice. If the interior O-Ring of the tank's end caps becomes damaged from inserting the carto without taking precautions (such as the slap yo mama tank tool) this can also cause the seal to leak juice.
Any issues at all related to vape quality are not influenced at all by the tank itself. The carto alone has control over vapor, flavor, and throat hit. The carto alone has control over whether or not the coil gets too much juice and floods, or too little juice and burns.
There are tons of different tanks out there, over 100 if I had to put a random number on it, so you can pick and choose which designs or features you prefer, or which ones you hate. The tank you describe with the locking ring won't ever fall off the carto, something few other tanks can claim. But, it has it's own issues. It's plastic tank body will etch and crack with certain juices. It also requires you to use XL cartos. Because the endcaps are permanently joined to the tank tube, they won't leak or fall off either, but adhesives are used (if that sort of thing worries you) and you cannot take them completely apart to give them a thorough cleaning.
If those are issues for you, you can get glass tanks that won't etch, tanks with caps that come off and can be completely taken apart. Shorter tanks so standard length cartos can be used. I'm starting to ramble now, but my point is, the choices are almost endless on how you want to configure your tank, so think about what you do, and don't, like and then set about finding a tank that matches those needs and wants.
If performance is an issue then try out some different cartos and see which ones you like. If flooding or lack of juice feeding is an issue then play around with different sized holes, and different number of holes. Almost every single issue people have with carto-tanks is actually user error, or a specific feature or design of THAT specific tank they are using, but not ALL tanks, so you can't really hate carto tanks unless you just hate cartos, because any complaint can either be fixed by getting a different tank or different carto.
