I may be a perfect sucker for every kind of gardening gizmo; found this UK (U of Sheffield) invention, called Gel²root, distributed here by Planters Pride: Any tips on using this stuff?:]
Looks like if you get one cutting per pot, it'll work out VERY expensive! And if a cutting fails, I presume you won't be able to re-use the stuff as it'll be infected with decay fungi. I also don't see what advantage it has over water or soil.
I tried a similar kit a couple of years ago and got 1 for 4 with green cuttings from a grape vine . Maybe there's a trick but I obviously hadn't found it. I had them alongside some more conventionally done cuttings in a climate controlled cabinet. The others had about 75% survival to 4 leaf. The lone gel specimen did not live thru the transition from the cabinet to the bench for hardening off (it had to be transplanted to a sterile potting mix at that point). The overall survival rate was a little over 50%, which I was happy with considering it was one of my first attempts at green cuttings with grapes. Ralph