I just upgraded to Ubuntu 9.04 on my laptop and netbook. The upgrade experience was quite smooth, but I’m expecting the bugs to start appearing. So far, I’ve found that gnome system monitor is crashing for some reason. I don’t feel very ‘jaunty’ yet.
I also tried installing the real-time kernel on the netbook but it failed to boot. Disappointing, as the real-time kernel has not been working for me since 8.10.
Update 1 May 09: Looks like the major issue with Jaunty is the graphics. EXA is supposed to be a new and better way to do graphics than XAA, but for me the performance is much worse (especially in Flash, which is already bad enough under Linux). On my old Dell D600 (ATI Radeon Mobility 9000) I had to set AccelMethod back to XAA. On my Asus 1000HE (Intel 945GME) setting XAA doesn’t work – I’m still studying the options. The new audio mixer also has some quirks. The only plus side for me is that on the Asus 1000HE touchpad edge scrolling is now enabled, but all in all I think Jaunty is pretty much a flop. No point getting faster boot if the system lags after booting.