Installer vs. Cydia
I just got back from vacation to find a new firmware update and an update to pwnage tool that includes installer 4. I finally got around to checking out installer 4 and I found it to be laggy and almost unusable. It spawns a new task for anything it does including basic things like loading images, which is the cause of the lag. Cydia on the other hand is fast stable and contains a very powerful backend. I plan to get MxTube up on Installer 4, but I strongly suggest using Cydia whenever possible. The apt backend provides an amazing packaging system to devs which assures all packages are installed & removed exactly how they should be. Unless you require shiny graphics in your package manager, Cydia should be all anyone would ever need.
Max