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Yes, am testing five pairs. Not sure which I'll use. TBH I've probably gone a bit mad over this and will find there is not much difference between them and that any of them would do. But, at least, I won't need to buy any trainers for a few years.
Tomorrow will be a long spanner session trying to get stem, extensions, seat post and drivetrain changed, and get frame bag and bladder setup ready to try out. Also get light mounts sorted out before final night ride to test them next weekend.
I assume you're testing both, rather than carrying both during the race?