This is the first time I have used a flail mower and I LOVE it. Nothing flies out, it doesn't throw you around if it hits something, and a much nicer cut. It does an awesome job on tall, thick grass and stockier weeds like clover, nettle, and primrose. It does pretty well with small bushes and undergrowth. I've got TONS of of Multiflora Rose on the hill, some of the bushes are 10'+ tall and more than 30' around. I went after one of them with it and the flail mower wasn't thrilled, but it did it. I had to let it clear is throat a couple times, but never had to get off the machine to unclog it or anything.
Your seat mod definitely interests me, but I'm hesitant to add any height to the seat as my head is already pretty close to the canopy. How much higher do you think your seat is now over stock?