He's one of the surest performers around, so Mark Maier can afford to take a few risks with this run at the Soho Theatre. One of those comics who's always working, he's honed his mirthful miserabilism over years on the circuit. This show, though, sees the Comedy Store regular take a sidestep from straight stand-up to show off his character-comedy credentials as Roni Shimoni, an Israeli soldier turned London tour guide.