i've played him mid a couple times. and i did suprisingly well. if the enemy mid gets anying but dorans you have first blood right there. his combo wrecks most mids and he can push the tower decntly quick. plus it allows him to utilize his ganking potential on both other lanes.
Wintermond wrote:
Top or jungle, he's pretty good at both.
Not sure about bot, but if DuffTime says it works, it works. :P
xD
Still haven't tried it yet, but I will be trying it if I can ever find a Leona player :3

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
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I'd say, try jungling to see how it goes, if not solo top or w/support bot like you've said.
I'd imagine his clear time is fairly good, AoE, armor reduction, and attack speed increase.
Seems pretty good to me, in fact, I might try it out when I get a chance now.