I'm using a PT105M from RS100 on my 500A. I wanted something wider than the pioneer mount as it's on a stud wall (reinforced with 12mm ply) and I wanted to mount it on 2 studs, but still get the screen where I wanted it on the wall. I also wanted a low profile mount as there's no need for cable to wall clearance with the 500A.
Overall it seems good, but there were a couple of issues.
It has a locking bar which is the width of the bracket and slides in once the screen and vertical bars are hung on the bracket. This means you have to have 80cm space to the left of the left hand vertical bar when the display is on the wall. I had to slide the screen to the right temporarily to get the bar in. If you're putting the screen in an alcove you'd be better with a mount with locking screws instead of a bar.
The vertical bars have a choice of 3 hooks to hang on the bracket, to give a bit of height adjustment, but the bottom 2 foul the bolts holding the bracket on the wall. This was a problem for me as I had to slide the screen to get the locking bar in, so could only use the top hooks.
It was also a bit tricky getting the power and display port cables connected as the bracket is so low profile, but the low profile looks good when the screen's up and connected.