Bought me a Bauer !!!

[Vtach]

If it were me, I'd sure want to know the quality of the gas I'm using to blend and breathe.  Doing PP fills on a cylinder that is lined with oil mist is probably not a great way to start, neither is 50 ppm CO in a breathing gas.

If I had just bought a compressor and designed my own gas blending station, I'd also make sure that I took the appropriate blender course and was trained and certified to dive the mixes that I blended.  It is not so much what you do know, it's what you don't know that will mess you up.  Trust me....been there...done that.

But hey, thats just me and my opinions, YMMV.  
Just remember, Darwins theory works its magic every day....