I wear these and Boreal Ballet Gold's in my street shoe size (10) for all day trad. For me, no shoe is more comfortable. For the colder months, I have a pair of 10.5's that I can comfortably wear socks with. I have also tried a half size down at 9.5 and they just took a bit to break in but were comfortably tight for better edging.

I would have given them five stars if it wasn't for their crappy rubber. I resole every pair I buy.

This is my 4th pair of Ace's are would fully recommend them for trad. The sole is super stiff and supportive for long multi pitch climbs. They also edge really well and the leather construction is highly durable for cracks and chimenys. The canvas lining keeps the odor down and wicks well. These do stretch quite a bit though so would suggest sizing down a half to full size.