Not sure if this has any merit here but I just had to send my HDMR back to Bushnell to get the parallax fixed. It went out on me when I decided to take it out and verify my zero last weekend. I've only ever had 2 scopes from Bushnell and both had to be sent back withing 100 rounds.
That being said, I absolutely loved the glass on my HDMR, in comparison to a NF and SWFA. I can not speak on Vortex as I've never looked through their better quality stuff. I hear the glass is better with the XRS and ERS so I would definitely jump on it, but if paying brand new prices for one I may consider saving a bit and looking for a used Steiner, Premier or something of the sort.