I still have six Lemo V1s. Actually, am vaping on one now. Yes, has a bottom screw, but I don't mind. Any Kayfun style has a simple build, they don't leak, have good flavor, and sufficient airflow. The Squape Rs is another simple mod. I have a KF Mini V3. the flavor is good, but the tank is just a bit small.
The reason i mention it is that, for me, these RTAs just don't have wicking or maintenance challenges. It seems of late that RTAs require a specifically tailored wick to get max flavor and vapor from them. Vapor is fine, but flavor and ease of use is a priority.
With the regulations coming up, I just look to have simplicity, so I am moving away from purchasing the latest and greatest.
Although my Reosmod is great, I found a 1:1 clone. Between the two and easy spare parts, they will last a very long time. I have a good mech that will also last. For whatever blessing, Provari 2.5 mods got affordable. They all work off of replaceable batteries, too. All simple, easy to maintain and will last.
A lot of good input from others here. I could, and do, have most everything mentioned and anticipate them to last.
Good luck!