opinion on vivobarefoot?

kennie2

Hello!
I am looking at getting some new running shoes, I used to run a fair bit a while ago but then injured my knees (due to the pressure that I was putting on them while running). Before I had some Nike trainers, Luna possibly but I can't remember, big chunky heel though so it forced me to land on my heel when I ran.

After speaking to a few runners they suggested I look into minimalist/barefoot trainers to get me landing on the top of my foot thus hopefully reducing the pressure on my knees.
I kinda like the look (and price) of these http://www.amazon.co.uk/gp/aw/d/B008K97SQC?vs=1
So just wanted to know what people thought? Also what size should I get? Normally I'm like a 5 1/2 and nowhere local sells them for me to try on