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I do like to save some weight for racing shoes, but when it comes to the marathon distance, comfort is so important, even if you're running for a time. It's a mental slog and if you're conscious of the calves going with a few miles to go, it's just another thing to make the voices command you to "slow down"! I guess the Glides are a similar weight to Cumulus but because they feel nice and springy they could make a good marathon shoe, as they may help delay the feeling of fatigue.
I think I'll be wearing them for VMLM where I'm doing a 2:59 pacing job for Runner's World. Should be that bit kinder to the calves than the Boston Boost.
Was considering these. Nowhere near as quick as you (would like to go under 3.30 for London) so thinking it might work as a marathon shoe (and I don't really have a different shoe for race vs training). Currently using Asics Gel Cumulus.