Right next door to amazing, actually. I run it in rotation with a Double Barrel, and vape it in the evenings at home. I usually run through 25-30ml of
juice at 20-30 watts before needing a battery change. Actually, both the Squid mods get excellent battery life. I'm pushing 20-25 ml through Blitzen (coiled dual) on a Double Barrel at home and about the same on my work
mod which carries a Serpent SMM (single coil) on a single charge, and they load 18650's. It's rare to need to swap
batteries more than every other week. The T21 does better of course as it loads 21-20700s.