with my
rba's seems it doesn't want to fire every time plus the rattle snake noise gets pretty old.
I have 4 VV mods (Provari, Vamo, Itaste MVP, Itaste SVD) so I will only speak for them. The Provari and the MVP are the only ones that don't have the rattle snake sound. You'll probably have the same problem with these mods firing
rba's as well. More likely than not your RBAs aren't firing because of the safety features built into the mod. Most mods have an amp limit, show circuit protection, and low ohm protection. If you try to fire something with a low ohm coil, or if the ohms aren't stable your mod will not fire. Get a mechanical for your RBA's. They will always fire, no rattle snake sound, and with a low res coil it's a fantastic vape.