Bill,
I have been using an iPad to read lead sheets in PDF form for over 5 years. I now have nearly 6000 of them on my iPad. I have used two different programs - GoodReader and now I am using UnrealBook. Both programs cost me under $5.00 each and work really great. I am using the universal tablet mount from GigEasy which fits nicely on a mic stand.

I had a retina detachment in one eye two years ago and I can still see the iPad display just fine with one eye. About 4 months ago I purchased a Galaxy Pro 12.2 tablet which actually is a real beauty. I then purchased one of the two or three programs designed for musicians and it really was a loser. Compared to what was available for the iPad it was a no brainer to return the Galaxy Pro and replace it with the new iPad Air - cost $600.00.

In my opinion - based on 5 years real world experience - I doubt you can beat the iPad for lead sheets or lyrics. I don't recommend it for folks who want to display full piano scores. Bye the way, before I started using an iPad I used a laptop and there were lots of issues such as having to carry a music stand and things like turning pages when necessary required the use of a special plug-in device. The iPad is much less complicated.

Deane