+ohm Tanks are best run at low wattages (under 25W) and as result do not produce huge clouds of vapour meaning they work well for users who wish to more discreet when vaping in public.
Another positive of using +ohm tanks at low wattage is they do not chew through e-liquid (vape juice) anywhere near as quickly as their high wattage sub ohm cousins making them a more economical choice. In the early days of vaping +ohm tanks where the only option then in 2014 when sub ohm tanks hit the market +ohm tanks went out of fashion for several years. Now with more new users getting into vaping than ever +ohm tanks are back with many vapers looking for a more low wattage, more discreet, lower eliquid consumption vape.