I live in West Virginia; I know from hills. Just today I took my Greenspeed out for a long ride that involved significant hills. I have an eight speed IGH in back and a Schlumpf Mountain Drive, and I found that I could manage all but the very steepest hills. The others I might have managed had I not encountered them fairly late in the ride when I was tired and about ready to go home anyway.

My one experience with a delta-style trike was a HPM Tritan which I liked, but felt that when pushing it in speed it had a bit of a shimmy. Because the COG was so high, it also felt rather tippy.