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I doubt as the optics are very expensive there will be much market penetration at this 'speed' .I know from experience their is a massive increase in the labor to aspherise these fast mirrors. You won't find the bigger vendors who supply Obsession ( Galaxy , OMI ) etc moving into this area any time soon.
Mirrors this fast need a special coma corrector. Al Nagler has produced a prototype Paracor for F3 to F4 mirrors. I think the standard Paracor works pretty well down to F3.7 and acceptably at F3.5.
Fast mirrors require much greater integrity of the telescope structure as the collimation needs to hold at different tube angles to a higher tolerance due to the very small sweet spot that must be kept on axis with the Paracor. Focusing tolerance is also much less.
All that being said, if the new Paracor goes into limited production it will be one more option for the advanced observer to own.
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