I've cut lots of them open and haven't been disappointed. Some are on my site, but it would be too repetitive to post them all. As said above, that Endurance version is real great, but I've yet to cut one open.
They are much more into heavy equipment, and are 50/50 partners with CAT in the Illinois CAT filter plant (according to the SEC). But there are a lot that fit the smaller cars, but it has taken their distribution a while to let that sink in. There are several small ones I order 400 a month, and at one point had a 8 month backorder.