I must admit that I have the geekvape tab in the kit i bought. I use it as a base for the 22mm tanks as the Pico and Vtwo are just a little unstable. For my bigger custom coil builds I build on the Rx200s as the single battery tab is also a little shy when firing coils that need to run higher than 80w. Personally I can live without it, but it is nice to have.