I was going to start another thread until I saw this.
I'm also curious what the general opinon is.
I found PA to be an essential tool. Is it the same as the real thing? No, of course not.
But, it's a great way to hone my skills and learn more about what I like and don't like. My PA experience greatly influenced my decision about buying my first table.
It plays wonderfully on my ipad air, no discernable lag.