I had a lot of problems when I upgraded to Ubuntu 12.10 64 bit from 12.04.1 64 bit LTS. Suddenly, I could not print to my network printer, share folders and files on my Samba server, and I could not install or update popular third-party software apps like My Unity or Armor Forge. Basic functionality stopped working properly with 12.10. I re-installed Ubuntu 12.04.1 64 bit LTS and everything works right out of the box again. It's good to see that the speed and performance have returned as well. I found Ubuntu 12.10 64 bit to be a little bit slow and pokey. Another thing that I noticed is that there were a lot of random crashes with 12.10. Stuff kept breaking randomly and crashing. It was a very uneven user experience to say the least.
At this point, I don't know what to expect of 13.04 64 bit, but I am wary about upgrading. I have found LTS releases to be rock solid in terms of high quality and usability. I don't mind upgrading my operating system, but I hate re-installing an older version of my operating system because the newer one was just not as good as the old one. This was the case when I upgraded to Ubuntu 12.10 64 bit.
I really tried to like Ubuntu 12.10 64 bit, but there were a lot of problems that I could not solve for unknown reasons. The Samba server and printer issues were show stoppers for me. I lost printing and file sharing capabilities at home.
I said before that LTS releases are the best and I am more convinced that they are the only Ubuntu releases worth upgrading to in the future. I'm tired of distro hopping and I am tired of poor quality Ubuntu releases that force users to beta test new features for free. I want my System76 Lemur Ultra Thin (lemu4) notebook PC to run Ubuntu 64 bit LTS releases like 12.04.1 with the fewest possible problems over a long period of time. I don't want to fix a lot of problems caused by upgrading to non LTS releases in the future.
I learned a hard lesson. As much as I like new features as the next Ubuntu user, it's just not worth sacrificing the stability of a LTS release for a couple of nifty new features. Ubuntu 12.10 lacks any killer features worth upgrading for in my opinion. It's more of an evolutionary upgrade than a necessity for me.
Ubuntu 12.10 also slowed down my recently purchased System76 PC quite a bit. It took a couple of extra seconds to cold boot and it took at least an extra 10 seconds to shut down or reboot. I spent more time waiting for Ubuntu 12.10 to become ready to use than it was worth the trouble to upgrade to it in the first place. Compiz constantly broke and crashed a lot. Ubuntu Unity 6.8 was quite slow.
Next time, I'll wait for the professional reviews to come in. Linux Format gave Ubuntu 12.10 a 6 out of 10 which is quite poor. It's a solid D score which is barely passing. How Canonical can go from an A- for Ubuntu 12.04 to a D for Ubuntu 12.10 in only 6 months is beyond me.