Personally, if you are going to do more than one set of tires, the Rilfit can't be beat. I did a complete set of 36" Swampers (Q78s, actually) @ 18minutes ea. The blade had already been used on 3 sets of tires (36- 38" diameter) and still cut the Qs like butter, all deep (The Q78 has a 27/32" tread depth, and I groove my tires when they are brand new and full depth), single pass cuts, 35 degree day. When I say "like butter", I truly mean it- no effort whatsoever. The only thing that required effort and slowed me down was rotating the tire- I could have cut 5 minutes off my time by having the tire mounted on a spindle mounted to a table. Mine were just sating up in a corner of the garage. The Ideals are a TON more work, IMHO.
Michigan- The Only
Great Lakes State South of the Mason-Dixon Line.