Advances in Quality for Fast Mirrors

[Bundin]

I read recently that the coma problem in fast reflectors using high power is actually a problem in mirror quality, and that recent advances have made big, high precision mirrors available to consumers. Is there anyone with one of these short/big aperture scopes at ca. F/3.3, like a Webster or the Ultra Compact line from Obsession, who can speak about their high power viewing experience? Is this just a marketing scheme?

Also, I basically understand most of the optics principles for what they look like in a star test (over/under correction, coma, spherical aberrations i.a.) but I can’t make sense of the math for the wave ratio other than it’s good to be under 1/8 wave. What does this mean? How does the math translate into what is seen in the wavelength and also the image you see with your eye?