Who has used/seen/heard of them, and where can I buy some?

http://www.extremeoutback.com/Tire_repair.htm
http://www.4by4connection.com/tyrepliers.html
http://www.tyrepliers.com.au/

I've got a set. They beat the hell out of any other portable, manual tire changing system I've seen. The only thing I've done with them is break down and mount my 42s. It's still allot of work but, I like them.

I have never found a need for Tyre pliers.

I have always used a heavy truck or a Highlift jack to bust the bead.

Then I use two motorcycle tire irons and some times a 5 pound dead blow hammer to unmount the tires.

Mounting them again is easy

I can remove a 33" tire from my Heep unmount the tire and mount the new tire and have everything aired up and back on my heep in about 15 minutes.

I have mounted done 38x11.50 boggers I have also done 36 and 38 SX's the interco tires do take longer but duh.

http://ajax.extremejeep.com/rocktoad/Slickrock%20June%202002/deervalleyjune2002%20082.jpg
http://ajax.extremejeep.com/rocktoad/Slickrock%20June%202002/deervalleyjune2002%20083.jpg
http://ajax.extremejeep.com/rocktoad/Slickrock%20June%202002/deervalleyjune2002%20086.jpg

I have always used a heavy truck or a Highlift jack to bust the bead
Yeah, I've used the hi-lift method too. I've also nearly wound up in ICU from it. Also, when I tried to break down my 42" TSLs, I lifted the rear of my K30 off the ground without breaking the bead (and there was no way to use the front at the time since I had just cut everything off). It wound up kicking the jack out several times as I tried different ways of attacking the TSLs. Closer or further from the bead, either jacked the truck of the ground, hit the rim, or tipped the tire up throwing the jack out and dropping the truck. Anyway, that's when I ordered the tyre-pliers. Took several hours even using the pliers (there is a trick to it, takes some practice) to get them off the old rims and onto the new rims. I also found what looked like some sort of glue in the bead, so maybe that's why I couldn't get the jack to work. Anyway, like I said, I'm glad I got them just because I no longer have to screw around with the jack and take a chance on getting hurt by it.

Maybe it has just been my previous expierience with tractor tires.

Busting the beads on them is all big hammers and alot of jumping.

I've had alot of bractice with Bicycle tires and dirtbike tires as well.
Once you figure out exactly what it takes to move the bead down to the center of the wheel you find it takes alot less energy then you think.
That however never applied whenever I was removing skidder tires from the rims

My neighbor (Pirate member Glenn Bonner) has a set and I've used em a couple times myself and helped him dismount and mount tires. I can honestly say they work pretty darn good. We tried driving on the tire to break the bead, tried the highlift jack trick and nearly got a knot on our noggins doing that. The tyrepliers worked where the other methods did not. Glenn had some tires that were really stuck on some rusty rims and the only way we could break the beads was with the tyrepliers... It's not 'Easy' but they DO work. If you had to change a tire on the trail, it would be a piece of cake with these and no worries about whacking yourself in the head when you're miles from nowhere. :D:D:D