I rather use the mobile phone format on the web than the ap.  Well, I do use the ap to scan bar codes.  But was generally frustrated with it.

Is there any Help function on the app? The apps are developed by people outside of PBS so unless someone here uses it a lot, you might not find much help. 

I've noticed that it's not always accurate with my WL either. I just use it to scan book barcodes at the Goodwill to see if they have any wishers. That isn't always accurate either but, it's usually close enough to make the ap useful. 

IIRC, There are a bunch of things that you can see, just not use.  Wish I had known about the mobile format (at the bottom of the page) before I spent my money.

Yeah, there are a lot of problems with it.  My biggest pet peeve is that it only shows you the first 130 books on my Wish List.  I e-mailed the person that created it and he said he'd look into it, but it hasn't changed.  Like others, I just use it to scan books when I am adding them or looking them up when I'm shopping and do everything else by pulling up the site in Safari.