The question I ask myself every time I look at CCMs check valve is...why? If it is so important then why havn't I seen it on any other machines? The neighbor just spent a year and a half devoloping his 68 acres, and not one of those machines had it, nor does any other machine or package I've seen...
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You don't NEED the double lock valves. As you stated, lots of them don't. But as the systems wear and start to leak, the settings for the top and side will drift. Get's to be an annoyance, I would think. It's sort of a luxury that gets to be a real nice feature, but it cost more. Most folks don't want to pay the 5-10% more.
The reason CCM is about the only one you can find is because they are about the only ones providing a complete system for a small tractor. Most of the valves are large and won't fit on the small cylinders.
jb