I haven't tried this out before now for fear of the extra wear and tear, but I was needing to mow my fathers lawn. I had put some fertilizer down last week and then a few days later we got a 4" rain. Needless to say the Bermuda went nuts and so did the crab grass. (crab grass is another story) So it was finally dry enough for me to mow and it is so thick and still wet that it is really bogging down. I have a mulch kit on it. So I drive back to garage and am ready to get out the 36" Toro to whip out the rough stuff. (no mulch kit on it) I started thinking this would be a good time to try the double blades. So I sharpened up three more blades and put them in the x-pattern. Started it up and fired up the blades. I could tell it was harder to get them moving, but once up to speed I had no problems at all finishing his yard in a much quicker time with far less double cuts and at a faster speed. I was really impressed. I am not looking forward to sharpening 6 blades each week, but if it cut my time mowing down it may be worth it. About half of my lawns are weed free and half of them are more weeds than grass. It normally doesn't bother me but wet crab grass is usually very hard to mulch. Is this a similar result to what you guys running doubles have discovered??????