I've owned the 2/3, and now the 5. I love the comfort and added cushion of the 5, but I felt like the upper and lock down, and toe guard on the 2/3 were much better for all-around trail running. I get way too much play in the upper of the 5 owing to the lace-loop setup (stretches a lot), and there is very little protection for the toes. I could take the 2/3 on rocky terrain and off-cambered terrain with much more confidence than the 5. Endurance of both uppers and midsole are amazing, and I even was able to resole my 2/3 with Vibram Megagrip outsole (w/deeper lugs!). I've seen a prototype/sample of the 6. Looks more aggressive, but still not sold on the upper/lacing. I'd like to see them combine the Lite and Speed into one all-mountain racer/VK shoe (a la the TNF Sky 2).
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