I'm a split-finner for life, I own a pair of atomics, atomic liquid blues and Oceanic V12s, and as many of my friends will attest to, I absolutely loathe my V12s. For me, with most of my gear, its a matter of finding a balance between ease of use and function. While I dont feel the V12s at all, I also never feel like I'm going anywhere. In surge, they dont put off enough power to keep me in place, and in current, they're too weak again. The regular atomics on the other hand are a the most rigid I have, and they arent as easy to kick with (still very easy, but not ultra effortless) but they have more thrust, so I use them when drift diving in case I have to swim up current for whatever reason. For me, the liquid blues are the perfect balance. They're soft and easy to kick with, but have enough thrust for my uses, although I still dont use them for drift diving. I can also do any number of kicks with them.
My friend used to dive twinjets, and has since switched to atomics, saying that with his dry suit, he needs a little more thrust.