I have been waiting for Pleco on the iPhone now for some time. I use the Palm T5 and have tried to supplement with other programs on the iPhone, for flashcards, etc. Getting a reader sounded great. I looked/bought Bookz Pro. It was an interesting exercise, with my following thoughts:
The good:
1) Small browser included, so you can get to external content.
2) Pinching algorithm - great idea, and I have seen this implemented in flashcard programs like iFlash very well, be it Hanzi or English.
2) Night time background/character setting.
3) Use of "zones" to tap, I still like this idea, for ebooks and for flashcards (other flashcard programs are also using this allowing content to extend all over the viewable area but still allowing tapping. If you are using sentences, etc., with a lot of content, I find this to be useful.
The Bad:
1) Getting information into the unit is annoying. Well, at least in China. I cannot get to the Gutenberg site for media so figure it has been blocked.
2) loading dictionaries was also a challenge. Some worked, some did not, and the steps to do it were excruciating.
3) They have a browser which I thought was cool, but they do not let you save a webpage and strip it down as text (best as I can tell). So, in the reader there is a sea of various binary/tags/xml that. Unfortunate as having the browser would be a great way to get content.
4) You need to swipe characters to bring up a definition. Swiping Hanzi on an iPhone appears impossible due to too small an area.
5) The pinching algorithm seems not to work if you have a file with Hanzi in it . I found outward pinching actually shrunk the text in many cases.
In general, if you want to read books in English and get help through English==>Chinese translation, the swiping of English words can be done. But, unless I am missing something, reading Chinese with Bookz current offering while looking to resize characters and invoke Chinese==>English dictionary calls is not practical.
Back to the Palm T5 for me.