I have not ridden it yet...so I am the same gathering info like you.
I also heard it is a tad flatter, with a bit more low end. I will probably get the 10 and see from there. I used my 10 so much last year.
$600 is cheap tho. I think the discount I have seen have been 25% or so...which makes is I dunno $200-250 difference.
I guess you'd always have that problem in a way.
I tend to choose the newer ones.