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I spent far too long riding shitty cheap Shimano cable discs whilst I weighed up the pros and cons of Avid vs Spyres. I've only ever ridden Spyres briefly but I wasn't blown away by them. They're also much more expensive and require a reasonable amount of maintenance (for a cable disc - compared to a BB7 which requires near enough zero). Plus BB7s seem a lot more robust.
Anecdotal but I've only ever changed pads in BB7s in the shop, wereas I've had at least one dead Spyre, despite seeing far fewer of them.
Interesting. I have that same frame set up as 1x11. Desperately looking at options for hydro brakes as my BB7s leave a lot to be desired. Don't fancy those shifters though...