I purchased mine yesterday and ran them for 6 miles this morning.  Just like other Saucony shoes I've worn, and as many fans will point out, the brand's sizes tend to run on the short side.  I typically wear 9.5-10 and these were labeled as 10.5, so they fit perfectly.  I've worn FILA's toe equivalents for a few months, but the combination of toe socks and slightly curved fourth and fifth pinkies make it a little painful at times.  The regular toe box is comfortable on these Hattoris and tight enough to keep the shoe in place.

My main concern was the sole's durability.  After this morning's 6-miler, I couldn't detect any significant wear anywhere on the shoes.  They were comfortable all along the route.  Some users have complained of minimal breathability, sweaty feet, etc., but the right pair of socks (thin and wicking) should do the job.

The shoes are extremely light; appear to be durable enough for running on asphalt, grass and gravel; and quite comfortable for zero-drops.