Been using it for about a year now linked to a GNS 2000 with few problems. I did however download the app to my iPhone just for a lark and am now completely taken by using the iPhone instead of the iPad. In built GPS, small size (I just sit it in it's case on top of my knee pad in a way that it's secure) and completely faultless in use.
I found that the iPad although obviously a bigger display had a mountain of stuff on there that I didn't use much. Basically you just want to see if you're on track 99.9% of the time. As for the display size, I'm using an iPhone 5 and have no problems and I'm 57 and wear spectacles.