I have a soft spot for SHFs and have had several in my collection. Down to my two favorites now (one for show, and one for go). I think their artwork is fantastic and they offer a lot of interesting combinations, hence I bought a lot, appreciated them for a while and then let them go.
I'll say that they aren't slicy as compared to most CRK folders and many Hinderers, as mentioned above. They are thicker stock and that's the point of them, to be great harder-use folders. They have thick handles and are big and heavy and built to withstand anything.
Are your CRKs with or without inlays? SHF is thicker than plain CRKs, and feels about the same thickness as inlayed CRKs (mind you that thickness is the entire handle on SHFs, not just in the middle bit like on inlayed CRK). Ergonomically for me (size large hands) SHF is very comfortable. The wide handles fill my hands nicely and are more comfortable to use than Sebenzas, Umnumzaans and Inkosis (other than the Inkosi with inlays, which feels different but roughtly even with the SHF comfort-wise, for me). SHF is a bit less refined though, so during a lot of use without gloves I can certainly feel the sharp gimping on the blade and handles biting into my hand.
As others have stated, Spartan also has amazing customer service. About on par with CRK but a much smaller outfit.