Is this modem any good?

Modems, as long as they can support the maximum data rates provided by your ISP, are rarely the problem. At least, that's not where I hear the majority of complaints. The complaints usually start when you introduce a router, and worse, wireless over that same router, since these always increase latency to some degree, some worse than others.

Since you already have the modem, just try it. The specs are sufficient for your ISP. And ultimately, the modem has to satisfy YOU, regardless of what anyone else has to say, good or bad.