Are you saying the Matcos are little more heavier duty than their Mayhew 28640 cousins?
there's a significant difference between the typical mayhew/catspaw/astro pneumatic/made in france version and the matco (HCPR20A)
i have the blue $30 blue handled astro pneumatic one, been a year in service and not much left in it. so i got the $30 catspaw 45650 (made in france) as a back up, essentially the same setup and grade of materials.
then i saw the matco version on sale for $60. I can say it's easily worth the regular $90 price...
matco has thicker cable, a return spring inside the head (in addition to the one in the handle) that keeps the jaws seperated, so you don't have to manually seperate the jaws after a 'miss'. plus matco has the kink relief right where my astro pneumatic one starting to rip apart. matco has a threaded adjustment nut on the end of the cable, and that enables you to squeeze the clamp all the way, which is critical on newer cars, because you'll never be able to slide the clamp over the ****** without squeezing all the juice out of it! they all close nice and tight when unloaded, but as you can see in the pictures, the catspaw one bottoms out (the handles touch each other) and the clamp is not squeezed all the way. and if you look carefully, the remedy for this situation is to grab the clamp ear with the 'inside' edge of the tool, which is not a design intent and very likely to end up slipping and possibly shooting the clamp across the shop...also, matco has ratcheting positions throughout the squeeze range, so you don't need to squeeze the hell out of smaller clamps just to get the tool lock. (i think mayhew 28640 has the ratcheting feature too)
here's the catspaw closed, no load, nice and tight:
ah, here's the catspaw under load all the way(handles hitting each other), not that tight anymore, clamp is not squeezed all the way: (it only gets worse as the cable stretches out in time, and there's no mechanism to make up for that slack on catspaw)
that's the trick to squeeze the clamp all the way using the 'inside' rail of the head: (wear safety glasses!!)
catspaw open, barely making it:
matco has a little more room (notice the return spring inside the head, very handy feature):
matco squeezing the clamp all the way and locking at thte same time, thanks to the threaded adjustment:
matco close-up, ratcheting mechanism and kink relief and adjusting nut (you can always tighten it up as the cable flexes over timem, you'll never bottom out the handles without closing the clamp all the way) i think the release lever is much better positioned:
more photos to followw...