I've been to all of them along the 401, the one at Courtney Park and Kennedy, and a couple others. I have to agree with you, they are some of the best, and cleanest truck stops around. Now the Filthy Wheels are a bit different story.
I always liked the Husky in London. Usually was quiet, and easy to get in and out of. I think the one in Missassauga is likely the worst one I've been to simply because of getting in and out of it.