Former TMO rep here so I've gone through tons of phones over the past few years. I'm an addict!
When the Amaze and SGII came out at the same time, I was still working at TMO. I spent about three weeks tinkering with both phones before I decided on the Amaze. At that time, the camera won me over as well as Sense. I had a SG4, that was passed down to my wife, so I was familiar with TW but didnt care for it much so I rooted it and added a different launcher.
Beginning of the year I picked up the HTC Radar just to play around with WP7. Decided to get rid of the Amaze and go with WP7 for a couple of months.
End of Feb came around and missed Android too much so decided on getting the SGII but kept the Radar anyway.
Fell in love with the SGII. Got rid of TW and added GoLauncher with ICS theme. The phone might feel cheap to some but this thing is super durable. Have dropped it several times and not a single scratch.
Now here comes the HTC One S and I start to get itchy for something new. I have spent many, many hours at the TMO stores playing around with the One S and just don't feel like its much of an upgrade from my SGII. My phone gets anywhere from 12Mbps - 19Mbps consistently in speed. Every One s that I have played with hasn't done any better. Of all the browser test I've done, my phone keeps up with the One s. I know the One S is faster but its not by much and not noticeable.
Now that I've gone to the 4.52" screen, I got spoiled and I still think the SGII looks better.
Hoping that the Note comes to us soon.
So to sum it up, coming from a SGII or Amaze, i dont think its worth the upgrade.