Well, the MVP 2.0 had to be put on the charger, no biggie. The SVD has sent back to FT with a wonky fire button. The six month old v3 is getting warm to the touch, weak green light and power, 4.1 to 3.7v in about 7 vapes. The other v3 went for a swim in the ocean (son's fault).
If I don't cave in the Twist button, by dropping it (on carpet!), they will last almost a year. I believe the Joyetech eGo-C Twist hits harder than the v3 and maybe the MVP with a higher amp switch and a half second longer on the cut off (don't quote me).
Though, I am looking forward to receiving my SVD replacement (in about a month).
Which Innokin products do you own and for how long?