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I don't really know anything about CFFs. They are probably great.
The usual weak spot though is the accessories. A weak focuser that flexes, tube currents, using carbon fibre for APO's etc.
I do know that APs have every aspect covered really well and they won't let you down.
If CFF get .99 strehl then that is extremely impressive if they can provide an interferogram to that effect.
Greg,
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