Can’t be hotter than Naga Jolokias and with skoville units under 5000 it’s closer to a Jalapeno.
It's not so much the heat, as the flavor. Some varieties are very mild, and roasting brings out good, smokey flavor. Others are a little warmer, and some are hotter than jalapenos. I prefer the warmer and hot varieties. My wife prefers them a little milder.
/johnny