I have never thrown the Phaze, but I know 4 guys with it.
all 4 of them are good bowlers, and all 4 of them sucked with the phaze on house shots. just didn't turn the corner or allow them to open up the shot as they are accustomed to doing.
3 of these same guys also bowl our local sport league. and on the shots with dry back ends or shots that needed a straighter line to the pocket, the phaze was awesome.
If you get a Phaze for a benchmark ball or as an only/primary ball I think you are going to be disappointed. if you want something to fill a gap, especially for a sport condition, then the Phaze could be the right piece.