That is my favorite Ubuntu release. I was on it for the longest period till last month when I shifted to Lubuntu 12.04. I have lost out on a few things, but I was getting tired of hunting for alternate sources of software for their latest version.
Lubuntu 12.04 is unbelievably good. Everything works out of the box and it just stays out of your way. You can choose Openbox at the login screen too. Highly recommended.
Lubuntu 12.04 is fantastic on my netbook, which I use for writing and other offline tasks where I don't want to be distracted. I don't think I'd be as high on it for a desktop or a daily-driver laptop, but I have a retina MBP for that.
Lubuntu 12.04 is unbelievably good. Everything works out of the box and it just stays out of your way. You can choose Openbox at the login screen too. Highly recommended.