Are you extra-super keen on the absolute best views ever or will a very, very good view suffice? At this size, prices become a major factor, the difference being many hundreds if not thousands of 'star coupons'.
As Adrian noted, do you think that extra .05 of a "Strehl" is worth it.
For general observing, I'd say probably not. Only if I was to catalouging objects or doing long-term observations of a piece of sky, would I be that worried.
Having said that, I'd want the best GSO mirror I could get though!
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