They're probably the 1st company I'd recommend. Back when people only recommended Crucial, OWC, or 18004memory (are they still around?), OWC was the only one who could sell you fantastic RAM (including Crucial RAM) at a cheaper price, still offer you great service, and still offer you a fantastic warranty.
I don't know, but I don't recommend many other vendors for RAM, maybe just OWC and NewEgg for Americans.