It's been almost a month since Coldbird released an update to his online client for PRO custom firmwares. He's back with a new update.
The new update provides a fix for the disconnect problems that were experienced in God Eater Burst and a 3 second delay has been added to the Start button. Small update but progress is progress. Coldbird has also implemented an overall status page that shows who's playing what. Finally, individual support threads for games have been added so users can communicate with one another for support.
The PRO Online Client requires that you are on one of the 6.xx custom firmwares on your PSP Slim or newer. This unfortunately, will not work on the Phat PSPs, due to memory limitations. The PRO Online Client is the Xlink Kai for the PSP. With ongoing developpment, server updates and what not, I'm sure that this can evolve to something a solid release.