Anyway the second impression is slightly negative than the first ! I've had some unforeseen problems while upgrading my office computer (An HP DC7700 desktop). Here is the list.
1. The Kernel started messing up with the USB. I kept on getting the 'connect debounce failure' all over the place (the consoles and dmesg output flooded) . This is a known bug (See the bug report) and there seems to be no clue of what is really happening. I compiled the kernel without bluetooth support (since most ppl reported this problem with the bluetooth enabled. The DC7700 has some bluetooth hardware which I never use) but still the problem is there. For now I've unloaded the ehci and uhci modules (thus disabling the USB support) and waiting to find a cure !
2. The ATI graphics drivers were a mess. However I found this great piece of software called envy (apt-get/synaptic for envyNg) that solved my driver problem for good. fglrx started working for the first time (couldn't get it to work with Gutsy) and enabled compiz - works great. However it took a while for me to figure out that using aticonfig to generate the xorg.conf is not the right way to go !
3. I had a compiled version of FF3B4 and the Hardy upgrade did not change it. However it started grabbing too many resources too quickly and I had to change the symlink manually to point ot the FF3B5 that came with Hardy. Not sure why the installer did not change it automatically but it gave me a headache about a day later!
All these are not so big issues (except for the first one) and I still love Ubuntu :)
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