The 6 WOA is a great round. I build the 6 WOA and I also build the 6 x 6.8 (simply a necked-down 6.8) The problem that you run into is where do you draw the line as far as performance. The 6 x 45 is not the performer that the 6 x 6.8 is, but then look at the investment. You have readily available, and VERY inexpensive magazines. The brass is probably the most available brass of any rifle round, and the bolt is the same as a .223 bolt.
I sell a pile of the 6 x 45 simply because they are a "good bang for the buck" build. Most of my customers that feel the 6 x 45 isn't enough simply by-pass the 6 WOA or 6 x 6.8 and have me build a .243 WSSM. Again, you are getting into more expensive brass, and magazines, but you are pushing the 70 grain bullets at 3600-3700 FPS and the 80 grain bullets are doing 3400-3500 FPS, so the "bang for the buck" with the more expensive brass and magazines is there.