CO2 and my Millermatic 200

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I was reading on the Miller Forum that certain MIG's, including the MM200 that I own, we're actually designed to run on straight CO2 and not C25.  I've seen some here state that their Passports actually make nicer beads with pure CO2.  Has anyone here at experience running pure on a Millermatic 200?  I'm wondering if I should make this gas my next refill.  It seems that it should last forever for me based on the fact that it solidifies in the tank and then sublimes to gas.  Where the beads aesthetically that much different than C25?   I pretty much use my MIG to repair my friends equipment.  He's a landscaper and the price he pays is the gas refill and nothing more.  I found trying to use SMAW on sheet metal to be impossible for me, and TIG to take forever on long runs.   Thanks.TA Arcmaster 300CM3XMT 304S22P12 suitcase feederX-Treme 12VSOptima pulserTA161SMaxstar 150STLHypertherm PM45OP setupStihl 020AVP, 039, 066 Magnum
Reply:MM200 runs great on co2, very little spatter if you set it right.The beads can look alot like c25 but usually don't look as bright, easy fix with a wire brush.
Reply:I use nothing but CO2 in my machines,a Miller S52 feeder unit off a Shopmaster and a MM250. I can't tell much difference in appearance but you will get more spatter if you don't keep a tight arc.Because the CO2 comes in liquid in the tank, it lasts me about 4 times as long as the mixes and costs a lot less. It really shines on the smaller machines as it gets much better penetration than a mix.