Ive used this app on my 3G for about a year, and after upgrading to iphone4 I found Its incompatible. This is symptomatic of this app---as far as I can tell they have never updated it, despite a number of annoying interface flaws.
Some of the annoyances include that you cant select the type of search (e.g. Books, journals, etc.) until *after* youve done one search. So you have to do a "pretend" search before you do your real search. Another problem is that it doesnt remember where you are in a long journal article---it treats it as one massive page, and you cant bookmark your position. Also, theres a scrolling bug that sends me to the top of a long article before Im done, and then I have to search to figure out where I was. Also, quoted sections in fixed fonts do not size properly and are difficult to read.
Also, theres little content that formats nicely like the screenshot---at least Ive never seen it.
There are other issues, but my point is that the app has never been updated and these issues never get fixed. It feels like abandon-ware.
And why do they charge money for it? You still have to pay a subscription fee.