I've used Ernie, and have always been happy with the stencils received. I've also used TUS, and was happy with theirs as well.
Recently, however, I've started to make my own using supplies from IMG, and while I still need to tweak my process just a little, the results seem very much on par with what I've received from Ernie and TUS, and now I have a little more freedom to make whatever I need, whenever I need it, and ultimately at a much lower price.
YMMV