Difference between mb shoes/pedals and proper road shoes

At the moment I have mb shoes and pedals so I don't have to worry about walking in them. Just wondering what kind of performance gain could be expected if I were to upgrade to proper road shoes and pedals?
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Performance wise you gain more foot stability at higher cadence, but you might find it will hinder you more in town.
I opted for the dhb R1 shoes and am very happy with them.
I have seen this question asked innumerable times on this forum and the view seems to be that for serious racing a road shoe / pedal gives you a wider, stiffer platform to stomp on, and you feel more attached to the bike.
Some people claim that the smaller contact area of spd's leads to hotspots on the soles of the feet, but I've never experienced this and a decently stiff soled mtb shoe should make it unlikely.
Unless you want to save (for example) 10 seconds or so every 5 miles or you can feel the pressure of the small cleat on the ball of your foot, personally I'd stick to what you know.
http://www.visiontrack.com
I've yet to master clipping in & out as readily (am nervous at junctions) but it's a much more solid combination than my old setup. The shoes are so stiff, that's a big plus for me but no doubt you can get two-bolt shoes that are as stiff.