SpaceBus
Minister of Fire
I've split about 10 cords of hardwood by hand this year with this combo:
8# Fiskars Maul
8# Sledge
Fiskars X27
I use the maul as a wedge on the giant rounds and just pound it with the sledge. The x27 does 95% of the work though, I only use the maul/sledge when necessary. My wife who is 5'4 and 120 lbs actually prefers the maul...go figure! They have held up nicely even hitting all sorts of hidden metal, rocks, and driveway along the way. I just touch up the edge on the x27 with my chainsaw file if it gets gnarly.
The Gransfor's looks like a really nice tool I'd love to try one out. Hard to justify the cost though when I love my x27 for 1/4 the price. If I ever splurge on a new axe it'll be that one or something custom. Next purchase is going to be a splitter I'm going to split (lol) with my father and brother in law. No sense in each buying our own we are all local and can share!
Be careful pounding on hammers with other hammers (a maul is a hammer with a sharp side). If you do, wear eye protection, pieces of metal are likely to go flying. Wedges are ok to beat on because they will deform and are softer than the hammer. Your Fiskars maul is very hard steel and you could cause some significant damage beating on it with a sledge.