Not sure what the point actually was, but I think everyone needs to understand that at some point, everyone makes a choice on what manufacturer to go with, and if you invest heavily enough in that brand's line, it would take a lot to make you switch to another brand. I've been using DeWalt's 18V (I'm in the UK) XR tools for 5 years now. I own most of the 18V XR line at this point and recently invested in a few FlexVolt tools and batteries as well. I am 100% happy with all of my tools and what I've seen and experienced with FlexVolt so far has really impressed me. There is nothing in the world that would make me go out and buy a cordless tool from Makita, Bosch, Milwaukee or any else at this point. I own half a dozen each of the DeWalt 4AH and 5AH batteries, plus a few 1.5's for flashlights, the impact driver etc... I've bought the majority of my tools bare so I don't end up with the ridiculous amount of extra chargers that I don't need. It's a good system and I'll never change now, even if I wanted to I'm too heavily invested in it at this point for that to be an option.
The 54V grinder is by far my favourite tool, to have that much power in a cordless grinder is immense and it has made my job a lot easier. As soon as the 54V SDS Max comes out in the UK I'll be buying that too. Looking forward to being able to leave the 110v and transformer in the van when I need to drill 22mm holes for conduit!