I finally tried this shoe out a couple of months ago and have to say I really enjoyed the fit and feel of this shoe. I primarily used them on some single track that was hard packed with a mine field of roots and granite. I took it for a spin on the first run for a 22 miler and no aches and pains to note. The shoes obviously lack the durable nature of cushioned comfort, but the vibram sole is very tough and provides adequate traction on flater surfaces when it is dry out. If it is a bit wet I have noticed the non grip really doesn't bite, they are not aggresssive but that is not their design in the first place. The shoe material envelopes the foot and is non abrasive against human tissue which reduces hot spots and material burn. The uppers and sole are extremely maleable and flex in unison with the foot. I wear a size 10.5 and these fit me in a 10.5 so I will say they are very true to size. Keep in mind they are designed for no socks, but you can wear socks with them. If you wear socks this will change sizing considerably. The inside foot bed is designed with a seamless structure to reduce friction. The ankle provides a low profile, but the heel does rise a bit higher than I would have expected. Other than that I like the design of this shoe very much. The laces have had a problem staying tied from time to time, which as a runner can be very annoying, but other than that I think this is a solid product. Warning! if you need a lot of toe kick protection or to box protection this shoe is definitely not for you. To all of those out there who are looking for a very minimal shoe with good flex and sole protection, this shoe will do just fine.