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Negative, no brake sensors. I ride it slightly different to a regular bike (particularly with a deraulleur setup), but it hasn't posed any big issues yet, but I haven't ridden it in much traffic. @pryally has a lot more miles on one than me, and had lots of great advice when I was considering what to go for.
It's possible to tidy up the cables with a little top tube bag. I need to get some extra bottle bosses drilled for the battery (atm it's held on with two bottle cage adapters and some hose clips: seems sturdy but untidy), then I think I'll get a custom full-triangle framebag to contain the cables and battery to neaten it all up.
You can change that with a USB cable though, as well as making the assist a bit more natural at higher cadences.