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I'm not bothered about stiffness, I just think it's a worse system. My last set of square taper cranks wore away to the point where they fell off as I was riding along. (I didn't know a lot about bike maintenance then though.) I also don't care about Q factor at all. Tuneable chainline is a big plus though, and also ease of replacement in Mongolia.
Maybe I'll give it a crack then
gtfo
The future is square (and slightly tapered).
Tuneable chainline and Q factor is worth more than the stiffness. FACT.
:)