The Nike Free 5.0+ is the new name for what used to be called the Free Run+, which went through 3 iterations before they changed the name. The three main shoes in the Free running line are thus now the 3.0, 4.0, and 5.0, and the numbers essentially signify a scale from more minimal to less minimal. I reviewed the Womens Nike Free 3.0 V4 last year, but have not tried the 4.0 yet.
I bought a pair of the Womens Nike Free Run+ 3 sometime last summer and ran in them several times. For some reason I never got around to doing a review, but lately I’ve been pulling them out more frequently for casual use. I figured I might as well write something up after a refresher run. So, I took them out for 5 miles yesterday and wanted to share my thoughts since my guess is they will soon be on clearance with a new version (Free 5.0 v2) apparently coming soon.
the Nike Free Australia Free 5.0 has a stack height of 23mm heel, 14mm forefoot for a drop of 9mm. The 3.0 has a stack height of 21mm heel, 17mm forefoot for a drop of 4mm. So the 5.0 has a bit more cushion under the heel, and a bit less under the forefoot. To be honest, the feel is not hugely different to me.
Typically not quantified, but another way in which the soles of the two shoes differ is in width. The sole of the Nike Free Run is quite a bit broader across both the heel and forefoot.