The caveat is that a dual chipper cannot be used in competition (a single sided chipper can, however).

But, for the sake of your golf game, you might want to learn how to chip with your other clubs. Dave Pelz gives some great insight into what club to pick for a chipping situation. That aside, my favourite chipping club is still my Texas Wedge (as my chipping is still horrible - I don't trust it yet, so often overswing and decelerate). The Texas Wedge, however, is easy to use, and is often more accurate for someone with weak chipping. My mantra is 'If you're on the collar, use the putter'. Plus, this leaves room for another wedge... mmmm.... wedges...