Vivis are very easy to rewick.
I think I've found a wick and coil expert, rewicked a clearo for the first time ever making a coil, with 2 mm silica on the second attempt and he never watched a single video. It now vapes as well as a vivi.
I do have a vivi that never leaks. Mine won't stand upright unless they are on top of a device, and I won't use egos as vivi nova stands. This is a genuine Vision, sold with heads that had short wicks, so probably an older version, but it vapes well and never leaks.
I also have a Smok R, that does leak and has an airy draw. I think the reason is because the stopper for the filler hole shot across the floor when I tried to put it back the first time, and never found it. I have something in the hole but it isn't a tight fit so juice leaks from it. An R is like a vivi, but instead of a replaceable head it has a long silica wick with a coil in the middle. You take the bottom off, put a new wick/coil in, then clip the coil wires on sprung posts. It's a simple real rebuildable that's designed to use silica and costs more than a vivi because when you use the three ready-made coils tou wind your own.