Yes, I have BibleReader (www.olivetree.com) I have had an account and used it for many years. loved it on my palm, was okay on my Blackberry, and is really great on the iphone. All the resources I bought over the years have transfered over to each new platform (eventually). I have Greek, Hebrew, Latin, a dozen or so Bible versions a half a dozen or so commentaries, some dictionaries and others as well.
With all that said: the only reason I kept up with it on my portable devices is because Logos (www.logos.com) didn't have a portable version. Libronix, now Logos4 is my desktop and laptop library with about 4000 resources. it is my theological/religious library. They have released a new version for the iPhone/touch.
I understand that the Logos app by itself has a lot of resources available for free. No need to register an account at Logos.com. I don't know what those resources are, because I had an account with Logos since they started about 15 years ago. So having access to my entire library in this format is a HUMONGOUS plus!
The downside (if you can call it that in todays "connected" world, is that the resources are not all local, they reside on the Logos servers: http://www.logos.com/iphone
it is not slow either, since it is a client server-type app.
so depending on what you are wanting to do, I suggest Logos a try first. See if the free-available resources are sufficient (assuming you don't have a Logos account) and then even register at logos.com if you wnat, as I understand there are even more free resources available as well - before buying any of the non-free resources from olive tree. (they do have many free resources at olive tree)
The other side of that downside (which might be a downside for olivetree, depending on how you look at it) for Logos, is that Olivetree's resources are all stored locally and the app is the search engine on the local device. That means it's full functionality can be used off-line. I couldn't store my whole logos library on even the biggest available iphone/touch, even if I didn't store anything else on it.
The main differences: Olive tree is completely local, Logos is by necessesity a client-server-type app. So, depending on what you are needing, there are pluses and minuses for either. as an example, the BibleReader Olivetree app is supported on ust about all portable platforms and smartphones. Logos is only available for the iphone/touch platform. They may be working on other mobile platforms, but probably only for those with larger screens since the functionality of Logos is far more than a "reader".

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