You are certainly testing them in a manner in which finish mowers werent designed.
My the nature of the short deck, and relying on the suction created by the blades....finish mowers just dont do well on tall grass. They tend to just lay it down and by the time it stands back up you are already beyond it so it takes several passes to accomplish what a rotary cutter can do.
MY understanding of the meg-mow blades were to replace blades in standard mowing applications....like your weekly mowing of a lawn.
The jury still seems out on just how good they are at replacing a standard blade. On dedicated mowing forums.....they dont seem to get much love. But I think half of that is people just resistant to change. Why try and fix what isnt broken. And I think the other half is simply the cost.
My opinion is they have the ability to leave a better cut and/or at a faster ground speed since you are effectively doubling the number of cutting surfaces. But Alot of guys (and I have done in the past) is simply stack two standard blades on each spindle.
MY concern is clutch life. Either with the MEG-mo's or double blades....there is alot more rotating mass to start and stop everytime the deck is engaged. But according to the professionals on dedicated lawn forums....some people are saying that there just isnt enough of a improvement to be worth the hassle. And some say they just dont stripe or distribute clippings as well.
For me the pet peeve would be the cutting height. It annoys the $hit out of me when the numbers on your mower height dont match reality. I have worked on toro, scag, exmark, bobcat, and kubota mowers. With few exceptions the running theme seems to be the mowers cut 3/4" closer than what the setting says. IE: set it at 4" according to the mower and actually measure it and its at 3-1/4. But they werent all exact. A few were 3/4" off, some were 1/4" off, some spot on, etc. Which makes it challenging when I services a dozen mowers for a landscape company. When they are set at "4".....they need to ALL cut the same height. Not really an issue for a homeowner, because they can use the number simply as a reference. But for a mow company.....trying to explain to the people actually mowing that "this" mower needs to be set at 4-1/2 and "that" mower needs set at 4, and that other mower needs to be 4-1/4, etc etc.
Some of the mowers had enough adjustment to make them spot on. Others didnt without other modification, like changing the thickness of blade spacers between the blades and spindles, or slotting the adjustment holes to give a little more travel.
On a mower like my scag.......in order to get it to read true (it was 3/4" off), the factor adjustment only allowed me to get 1/2". so I was still 1/4" off. So I shaved 1/4" off the spacer between the spindle and the blade. Switching to this blades would throw that off again. OR like if I could convince a mow company to buy these to "try" on a mower....now the deck calibration would no longer match the rest of the mowers in the fleet.