The 10" one looks too small and sits too high in my opinion. The 14" one is more typical, but feels too big. I like how it sits lower though.
This looks good on paper, but at 12x8.5 I feel like it will look off as well. The oval filters are harder to come by as well, which is a pretty significant con.
I think a 12" with a drop base (like the 14" one here has) would be perfect, but those don't seem to be readily available.
