I've grown Ring of Fire (Baker Creek's version) a few times, and loved it, especially in 5-gallon buckets.
I'm growing Timeless-tomatoes.com's version, this year. The peppers are perhaps less pointed, less shiny, smaller, and later, but that may be due to growing conditions (it was right next to fennel and kohlrabi, in the ground, in fast-drying soil, albeit mulched). I haven't tasted one, yet, but they made my fingers burn more than the other peppers I seeded (and some of those were quite hot); so, that's saying something. The Baker Creek version was often quite hot for me, too.
Note that a number of these hardly had any viable seeds, if any:
Location: SW Idaho, USA
USDA hardiness zone: 6
Elevation: 2,260 feet Profile post