It is a very nice phone as far as size and specs.
Here is all the information on it including the names its known by:
http://www.phonescoop.com/phones/phone.php?p=614
http://www.clubimate.com/t-details_jam.aspx
$590 is not that much of a discount as far as I can tell.
No Wifi integrated.
You also have to make sure your carrier has support on the correct GSM band. They make two types for the phone you are asking about.
850/1800/1900
900/1800/1900
Basically no US provider offers this phone which means you will have to get it unlocked. I have suggested such things in the past but always with a warning. It is usually easy to get voice to work. It may not be so easy to get data to work, which is usually important for pda phones.
I have not used it personally so cannot give you any subjective/objective advice as far as performance and camera.
I do have an opinon on the current rash of camera phones: Camera has OK specs but don't expect anything spectaular. No flash so good lighting is a must. There are no good phone cameras yet available. Sony seems to be coming out with one that is 2 megapixel so we'll see how good that one is.
You might want to try posting to the Jam forum to get user feedback.
I would like to re-warn against getting an unlocked GSM phone unless you have some idea of what you are doing. You are on your own for setup. Support is pretty much on forums like this.
(Point of etiquette, you can try to bump your thread but at least give it more than a day. Some of us have other lives)