The Fox Comp 5 boots are great boots that hold up well. I have had these boots for almost 3 years and havnt had any buckles break, tears or frays anywhere.
There are however some flaws in the design of the boot. Whenever you take a hit to the ground, or even clip a tree, the bottom buckle likes to come undone. I have noticed that on AlpineStars Tech-3's the buckle is latched on the other side, which is a reason why i am switching to that boot for my next pair. Another complaint is that water likes to find its way inside the boot. Racing GNCC where mud isnt a stranger, it gets quite annoying and feels unpleasant while you ride. My final complaint is the lack of protection on the inside of the boot. When kicking my bike over sometimes the lever shoots back up and bruises my malleolus (inside foot). I wish i had a picture saved, but it would be a dark one, not just a nick.....Dispite that drawback i cant say i broke my foot in the 3 years of owning them. Ive had my fair share of crashes in the boots and have not had any serious injuries.
All in all...The comp 5 is a great entry level boot for the price. Good for any trail rider or casual racer.