Is it an AT&T-version model 3347? There are those that rave about how great their AT&T 3347 modems are. I have no personal experience with them and don't know if there are generic versions and AT&T versions. I'd be leery of a generic version unless you can find confirmation that it works well with AT&T.
If you don't plan on jumping to UVerse, either VDSL or IPDSLAM, and you don't think AT&T will force your migration to IPDSLAMs in the near future, then buy it. If your broadband switchs to either UVerse version, you'd have to sell or junk it as it wouldn't work with those services.--
TCE Weather -- Mt. Rose Cam