Edge Converter

Anyone here have an Edge converter that there using? Are you happy with it?
They got back with a recommendation of street edge in the 2600 to 2800 stall range and an STR at 2.40, whatever that means. And a 9.5 inch impeller.
Let me know what your opinion of it is.
I got the mild street edge 2400-2600 stall in my 440 dart. Only 500 or so miles on the build but I've been pleased. No complaints at all.