I think the best Straight stitch machines are the ones that just do a straight stitch. The needle in any machine that does more than a straight stitch is designed to "Move" side to side somehow. yep....can get a bit of a wobble. The best machine I had for doing a perfect straight stitch was a Viking mega quilter. It only did straight stitch. There are other machines like that out there and some folks say even the old singers in a treadle do wonderful straight stitches. I did like the Mega quilter as it also had a scissors and a needle up/down setting which the old singers do not and it also had more throat space.