I've always been a push for this idea, have 2 field umpires with 4 boundary umpires who can call frees that the central umpires don't see on the rare occasion such as in Rugby, League and Soccer.
After only seeing it in effect once tonight (all be it with 3 field umpires) I thought it worked a treat, from my poor memory the boundary umpires only called 3 or 4 frees the field umpires didn't see and I thought they were all there, only thing we have to get used to is they call it late as they have to wait and see if the field umpire is going to call it.
I asked Mrs Wedgie what she thought of the umpires and she said she honestly didn't notice them, to me that's the ultimate compliment.
I'd be interested on others views of tonights game but I honestly thought it was the best umpiring exhibition I'd seen in my memory and the boundary umpires were NEVER out of position.
Definately a PLAY ON with this rule IMHO.