I don't have them, but from the looks of the package, i would have to pass. The clamps don't look very strong. I can't tell if those are 6 1/2's, but they do seem to have pretty good wattage handling capabilities.
Here's what i did, that i've been very happy with. I bought a 6 speaker box (6 6 1/2's) from Sounds Unlimited for $500 including clamps, then bought brand new Infinity 62.5i's off eBay, 3 pairs at about $70/pair brand new (and about 1/2 of retail). All told, cost around $800 and they sound great. Here's a pic