I have found this to be a very well thought out facebook and twitter application which covers pretty much everything i need it to do.
However, the lack of notifications for wall posts etc can be frustrating and should really be one of the more basic points.
The application also appears to crash/slow the phone down (this doesn't happen often but it's annoying when it does happen) which is why i have only given it four stars.
Another minor minor i can think of is the fact that any link clicked on is opened in the phone's default browser. As a user of opera mini i would much prefer links to be opened via that application. I'm not sure if there is a way of doing this already but i am certainly not aware of it if there is!!
definitely worth a download and a good few days use before coming to a conclusion!!