I used to use Humphreys lump a few times a year when I could get it (about 5 years ago). I liked it when I could get it, but haven’t seen it in a long time.
Just tried Jealous Devil tonight for my birthday dinner, and I enjoyed using this lump. It was indeed significantly hotter then other lumps I used prior. Little expensive but it’s nice to have on hand for sure.
Let us know how it works out for ya. How much did you pay?