I have been running 10.4 beta for a while so I am just doing an update. Before the update I made a nice discovery: I had problems getting the Realtek wireless working in my Toshiba Satellite U505 but this morning I noticed that Realtek had new Linux drivers available that work fine for me. Best to either buy slightly older hardware for using Linux, or to develop patience.
I only have two servers (usually I work with customers' servers on their projects) and I am trying to decide if I need to update those. I host my own web apps on Google AppEngine and Heroku so my servers are largely unused.