The thing is I'd say you'd have a lot worse track record after a year with the Twist. The device is kaput when the battery goes. Three out of ten doesn't sound that bad.
You're right, Mickey, it's not that bad. It's just that when I first began buying (and using) Madvapes VV Boxes, I didn't mind screwing on an inline voltage display every time I changed something. Nor did I mind the fact that the adjusting screw is far from linear---sometimes it's really a pain to hit the exact voltage I want because the slightest turn of the adjusting screw puts the setting well past that. Then I turn it back a tiny bit, and it overshoots again, this time lower than I want.
None of that bothered me last year. Now I own numerous VVs with displays that adjust incrementally---three Young-June Vtubes, a Smoktech Vmax, and an Ovale V8. Yes, I know that Madvapes makes a VV box with a built-in voltage display, but it still has the non-linear adjustment screw. And anyway, of my former 10 MV VV boxes, two were the kind with displays, and those were two of the three that crapped out on me.
Do I still like my seven remaining MV VV boxes? Yes, just as much as I still like my five other similar dual-14500 box VVs, but I'm getting spoiled in my old age for ease and convenience.
I also own two 650mAh eGo Twists. They're OK, but they don't vape with anywhere near the impact of my other VVs. I can't yet speak to longevity, as both are only two months old. So far, so good---but I wouldn't buy another Twist.