Hi, I used several Zyxel modems, they are very popular here, never saw on the market here Zoom and other modems mentioned on a site. So Zyxel Comet 3356 worked well, but sound quality was not the best. Then I bought recommended Synway Cahta board, 8 ports and sound quality is perfect, really much better than voice modem. Another problem with Zyxel voice modems is that some older modems have only old drivers for win 98, so cannot properly install them on win 2000 and win xp.