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You can't get high magnification with fast refractors.
If you are after high magnification wide field of view is not a priority so 40-45 degrees is not an issue.
These eyepieces are for fast newtonians - I had one once - 315mm f/3.7. Coma and image quality of high power eyepieces was a major issue.
My guess is we will see these come up rapidly secondhand after twits try to clean them or worse, disassemble one - they'll never be the same afterwards.
On the positive side they did state they have coma correction, ie negative coma to suit newtonians. Probably designed or f/3 or 3.5.
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