I have the normal pin type, and it was pretty simple to do, so in my opinion, the ez mount is just another option. I've thing to note, as others have mentioned, the template that comes with sperzels for filling, isn't all that accurate, but i used the StewMac drilling jig and it was fine.
I would also be concerned about keeping the housings straight while tightening, which is where the pin type would be better.
If you really don't want to drill, the ez mount could be a good thing.
It's all up to preference, i feel.