look ace, feel ace, being able to ru nearly normally in clips is fantastic - with the rubber dummy clips in they're still a great performance trail/hiking trainer (i keep being bad and wearing them for work).  Stiff enough to wear on a bike for a couple of hours at a time (although not as stiff as full race SPDs, which you might want for all day rides touring), but flexy enough to run in.  Perfect for short races if you ask me.

Sizing is miles out, as others say

I am a UK 10.5-11, but find many of my US trainers end up being 12s (half a size bigger than what they should be according to the conversion charts)

These are 47s and fit me perfect, which would be exactly a whole UK size bigger (UK 11.5) according to the chart here:
[...]

bear in mind that the size conversions aren't consistent all the way through the sizes.

Overall Pearl Izumi Euro 47 = UK 11 I would say.

Toe box feels tough, but also roomy, and I have wide feet.

Laces are awesome (got some strange coating that keeps them from slipping), and the lacing system allows for a really contoured fit.