I just did my first O2 injection last weekend and it sure looks to have kicked off a quick ferment. I did my first all grain with the AHS Blue Moon clone with very minor variations.
When I put it in the primary I gave it a good shake/swirl for a minute or two. I dropped in my WLP410 starter, then hit it with 55 seconds of oxygen through a 2 micron SS stone. OG just above what I expected at 1.053 I had vigorous krausen and fermentation when I checked on it 8 hours later. It never blew off stopping just at the neck inside the 6 gallon BB.
I noticed 72 hours later the airlock was at 20-30 seconds between bubbles. I checked it twelve hours after that and it still looked pretty inactive so I took an SG reading. In 3 1/2 days it is down from 1.053 to 1.017. It already has a wonderful flavor signature to it.
I imagine it may still have a couple points in it, but I was impressed with the quick ferment. I'm guessing the O2 really helped kick this one down quick.
Primary: German Hef, Belgian IPA, Scottish 80, Belgian Dubbel
On Tap: Oatmeal Stout, Vanilla Oatmeal Stout, Belgian Dark Strong, Munich Dunkel, Dunkel Weizen, Oktoberfest, Bock, IPA, Black IPA, English IPA, Pale Ale
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