I went with Mountune as a package deal with the downpipe. I like it, personally. I can hear it just fine in the cabin, but it doesn't overpower anything else so you can still hear the radio or conversations. It sounds real good from the outside, deep sound at idle, it pops and crackles going down hill in 3rd gear from my work everyday.
The only drone I get is when I'm rolling up the windows while in my garage - if the fronts are already up and the back is down (especially the passenger side) it gets REAL drone-y. It only happens in my garage, so probably not an issue with the exhaust itself but the way the sound waves bounce off the walls.
I do not have a symposer delete; I've heard having one makes a difference (for the better) in the in-cabin sound of exhaust if you are getting a drone.
I'm happy with my purchase.