I am 5'8" and have been putting in about 20 miles a week.  These have been a great addition to my running gear.  I had previously been running in Hoka OneOne Clifton 2s and Speed Goats (for trail running).  I had done some reading on many of the more common runners sites like roadrunner and runner's world and ended up giving these a shot.  I am very pleased with these shoes.  They are way more durable than the Hokas as the bottom has better coverage of rubber than the Cliftons.  The foam bottoms is showing normal signs of wear but they are not getting as beat up because of the rubber sole coverage.  Don't get me wrong, the Hokas are a great runner too for big boys like me, and I purchased a new set of Clifton 3s to run on road days, but these are great both on and off-road.