joyetech brand eGos are all 10 seconds. Kanger EVODs, Smoktech Winders, Vision Spinners, and most knockoffs are 8 seconds.
I actually had to send back some knockoff Twists that I bought from DiscountVapers. They have their own DV brand, which used to have a 10 second cutoff, but the ones I just received yesterday (and sent back today for a refund) are actually 8 seconds. It's a shame, too, as the first DV Twists I bought had the 10 second cutoof, were great quality, and only cost $18 for the 900mah.
I may have to check out the Trueman batts that Kent C mentioned.