Steven Berkoff's name can clearly attract a youngish, hippish crowd, but Group X's production of his smart 'n' manic US-set play doesn't quite have the adventurous spark to ignite their imaginations. Berkoff's story of Frank (Peter O'Mahony), a discontented salesman who would love to be a mensch - a good guy - but is destined to be a kvetch - a moaner - relies on quick and fluid movement, among five characters, between dialogue and internal monologue. It's a familiar conceit, and the result is often hilarious, as when Frank's workmate Hal (Adrian Scanlon, who is terrific) gets a soliloquy of roaring anxiety when it occurs to him that he'll have to reciprocate a dinner invitation. Keeping up with the accents and Yiddishisms sometimes makes schmucks of the cast, though, and giving the play a brash New York dressing is rarely more than a messy irrelevance. Entertaining and occasionally affecting, Kvetch is too disjointed to kvell about.

Runs until Saturday