They seem to think the M&G's are a little bit better than the Kenda Klondikes, which were the only other sub-$50 tires that I was considering. I guess the Conti 240's at $136 and maybe the Marathon Winters at $117 (lowest shipped prices I could find online) could be better tires, but seeing as how I got the M&G's for $84 and I'll be riding in a city where they salt the streets like it's going out of style, I'm pretty happy with my decision. I will heed the warnings on this site, though, and try not to do anything really stupid with these tires.
I'll post my impressions after I take them for a spin later in the week or next week or whenever they arrive.