NBA TV is in HD for Verizon Fios now. It has officially surpassed Comcast as far as overall quality. I know I don't like watching games unless they are in HD, and now I'll get an NBA game in HD pretty much every night between TNT, ESPN and NBA TV.
Anyone who has a chance to switch should go for it. Especially if you have an HDTV. There are tons of HD channels and now the On-demand options are as good as or better than Comcast. They've made improvements over the last month or two.