I'm dissapointed in all of them. Now I haven't tried the Fiskars, but the review here didn't make me want one. Right now my lawn is pretty bumpy.
The Brill is just too light. When the turf gets thick, it just skims along the top.
The Mascot is too hard to push. I adjusted it per the manual and even back lapped it. To get an even cut across the bed knife, makes it really hard to push on my heavily sloped yard.

I'm having it leveled so I may then feel differently, Of course that wont change the grade. I'll probably get a powered trimmer for next year.