The Singer Knitting machine can also knit flat panels with a flick of the switch. I was really excited to use this function and it works well, except when turning around at the corners. You really have to ensure the hook gets the yarn as it sometimes slips. I also tried it with fuzzy mohair yarn and it kept getting caught, so it is limited to lace, fingering and maybe DK weight yarn in the usual wool/cotton, if you want to work fast.
If you are looking for something better, Addi machines have more weight and precision but cost almost USD$1k.