I also have the Nyon, bought as an upgrade. In it's defence, it suits my needs i.e. large screen that i can see without wearing glasses, lots of info, maps my rides etc etc. I had the Garmin 800 and then the 1000 before this, but with every bit of technology there are benefits and issues.
Even the Purion isn't ideal in terms of size or location on bike if your doing downhill / jumps, lets be honest here.
The kind of riding I do i.e. xc/ trail this display for me is an all in one solution and I have had no issues with it.