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Yes, they are the same as North Group. They can be good, but quality control seems to be lacking so sometimes you can get a bad one.
I considered the 127mm f/6.5 model myself but didn't do it in the end, not because of the quality but because I changed my mind on the "big achro" idea.
If I was buying one I would be asking the vendor to check the scope before posting it in case there are obvious issues. Even if you returned it you'd still pay for the postage between yourself and the shop so it's better they don't send it at all if it's a lemon.
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