Jacomus-rides-Gen said:
Pro - no-one will nick your bike
Cons - they look sh1te and offer no more hand positions than drops
PLUS - You need a shorter top tube than you would have on a road / tourer because otherwise the top bars being higher up and furter away will stretch you out, not sit you up as they are supposed to.
Bars, like saddles, are very personal things. These bars offer no more hand positions than drops, true, but the positions they offer are - obviously - different, more akin to a flat bar with bar ends. I quite like them.
For the top tube issue, I think you're looking at them the wrong way round! Fitted conventionally, these bars put the controls closer to the rider than a normal flat bar, giving a slightly more upright position, with two more stretched out climbing/cruising positions.
De gustibus, etc.