I've had these guys for about a month or so now and have really found them useful.
The Buddies are mounted on top of the Fence and are adjustable for board thicknesses. Usually, I put them so they are about 1/4 - 3/8" below the thickness of the stock. This allows them to put pressure on the boards - BOTH AGAINST THE CI TOP AND INWARD TOWARD THE FENCE! This makes the cuts Accurate and Safe. The boards cannot raise up to catch the top of the blade and cause kickback. The wheels are rubber and will only rotate clockwise......this prevents the board from coming back at you.
Installation: I suggest you use a MiniTrack or T-Track type of system bolted on the rip fence. This allows you to slide the wheels where they are needed and easy to take off/on. You'll need to mount the Buddies using 1" stock on top of the Bies Type Fence. I rigged up some 3/4" BB on top of a 1/4" thick piece of ply. I tapped the fence in 4 spots with an 1/8TH inch bit and then used self tapping screws from the Borg. I used the MiniTrack so it was recessed in a 3/8" dado to mount FLUSH with the wooden top. This is important (IMHO) so the base of the buddies won't flex back due to the pressure of the springs.
Next, Mount each buddy to the phenolic bases. this gives you the flexibility of sliding them to various positions along the fence. I had to cut the front thumb bolts back about a 1/4 inch so they would "clear" the tightening knobs that slide along the Mini track.
The Buddies are milled within a Dovetail track so they can slide about 4" total either toward the fence (for tight-thin rips) or farther out for general ripping.
The rear board buddie is used the most. It's a good feeling to have the lead edge of the board run under the wheel....you know it is staying down.
For precise groove work....I used the front wheel also. THis gives precision to the depth of cut and from the referenced edge. I've enclosed some photos when cutting drawer fronts, backs, and sides.... and then cutting the groove in them to hold the drawer bottom.
Here are some photos - (to be continued)