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They Zefal HPX are excellent for the money, very light (for the sizes), cheap and work well, it just take a little longer with huge volume tyres.
Standard Spyre will be fine, if they're decent, you should be able to feel it bite sharply, if it doesn't, the mount either need facing or the calipers doesn't allow the pads to sit straightly.
Bear in mind that the old 105 levers have a rather short cable pull, so it'll feel long with the cable pull disc brakes, the latest 105 (and the Tiagra, old and new) have a longer cable pull that work better with disc brakes.
edscoble-
...and there I was thinking I'd chosen good components for a decent cable disc brake setup. Didn't know that about the 5700's cable pull. Originally I was planning on running Shimano 5800, but the rear hub isn't wide enough to take an 11sp road cassette hence going for a 10sp MTB cassette with road 10sp shifters.
Annoyingly not silver, but Tiagra 4700 shifters seem like the best choice for compatibility? (Shimano XT M772 9 sp derailleur / Shimano XT CS-M771-10 11-34t cassette)
Thanks for the info!
jambon
Remember @edscoble saying somewhere on here they're good - also makes sense having a pump on the bike if I'm going to subscribe to Jan Heine's calculus about lower pressures and the benefits. Want to mount it on the non-drive-side seat stay although not sure if it'll be possible with the caliper.
I'm not sure if the SLC is worth the extra money over the standard Spyre, but probably will go that way if I buy 2nd hand as it'll just be a few quid more. Hopefully with compressionless housing it'll be a decent cable disc setup.