Think next time I get wheels I'll have to try one of those! Have you compared Diablo to the cheaper one yet?I got it at the home despot today, it's a ridged brand.
http://www.homedepot.com/p/RIDGID-4-5-in-Metal-Cutting-Diamond-Blade-HD-MTL45/204202513
I also snagged a more expensive Diablo, was labeled as better but I have no idea if it is.
For 10 dollars I really love this thing, I used it for what by my estimation was 2-3 lifespans of the blue wheels and its still like new.. you can also throw it in your toolbox and not care because, metal...