When I started I had the Smoktech plastic one...didn't leak and they are ok. But when I got my first IBtanked you can clearly tell the difference. I think because it has a better seal it just feeds the carto better. For me the cartos last longer and taste better in the IBtanked. Now I have 2 19 mm and 2 22 mm and plan on getting 2 more 22 mm.
I just got a Provari and have rediscovered my love for carto tanks.