I use Dual Duty Coats and Clark and I buy it by the box from Atlanta Thread. Much cheaper than even Walmart.
For redwork dishtowels that are going to end up being bleached I even use it on my embroidery machine. Gives a nice look. Can't complain about any aspect of it. Always does a good job on all 4 of my machines. I do use a variety of other threads for other purposes, but that is my normal piecing thread. Reminds me down to a couple spools of my regulars - need to order more.