I think that you will like it. I have both the MM6501's and a MM1040 svc and they play rather nicely. I was running the MM1040 in my SUV and it played plenty low and loud. However, it is not quite loud enough in my Lexus because the trunk is solid metal.
I am currently running Focal 165 V30's and the MM 6501's sound pretty darn close to them after some tuning. The Focal's are just a wee bit more precise in both the tweeter and the mid range, but both sets offer excellent mid bass.
sound quality wise i would say the same. i loved the sound of my polk, my friends 10w3 was ported and i never sat in the car, but i know their built to sound great
according to winisd 10w3 will have more output sealed
ported same size boxes the polk will have more output ~35hz below
10w3 probably sound good since it rolls off around 40hz then it will mix well with cabin gain
polk is shallower by 1", likes a smaller sealed box, and is ~$100 cheaper