The 1673 Kprobe scans are nice, maybe not nicer than burns from my 811 or 812, but a whole lot faster for sure. If your question pertains to the second quote you included, you can find a lot of posts regarding poor or erratic at best burns from the 1213-1633 (maybe even 1653) models, at least with the earlier firmware. And since newegg was selling the 1673 for a couple of days for less money than the 1633, as soon as I saw the posts from those that already had them reporting improvement I jumped on the bandwagon and am pleased.
BUT, keep in mind it takes good media. I think I have read good posts only on the MCC004 and maybe a CMC 16X +R blank. The 16X Verbatim (MCC004) +R media are reasonable now, like under $. 50, so I don't do the overspeeding 8X stuff anymore.