My experience with MPH has not been great.  In the process of developing the miner I've found two bugs in their XZC pool.  One of which allows a user exploiting the bug to get credit for a higher share rate than they are actually submitting, while at the same time not contribute to actually finding a block.  I've reported the bugs to the MPH guys, but they have yet to get back to me about the bug that basically allows cheating.