PoliceOrdnance is the Canadian distributor so you might want to compare prices with them. One thing to note however is that since sales to private individuals is such a small part of their business, they don't accept Credit Cards.
I've only ever shot CCI mini-mags through mine. Works great. One factor I didn't consider before buying is that the aluminum slide of the conversion kit combined with the polymer frame makes the gun even lighter than a stock Glock. Kind of a pro and a con all at the same time. I find holding steady with a light pistol to be a bit a challenge so in theory this should (with practice) help me improve my aim.