running 2 of the same amps into 1 pair of speakers [ first watt J2's]

has anyone tried / using something like this set up -

left output of one amp into left speaker [ leave right output alone] 

another amp doing the same with the right channel  to right speaker .

I have a friend that is using this set up - likes it feels it eliminates crosstalk  & adds some power  .

not sure about the power ?  what are pros /cons to doing this    if any ?