Getting tired of running the stock OS on your Xperia Ion? If so, official CyanogenMod nightlies are now available for the device (codenamed aoba). The first CM9 build hit get.cm just a bit ago, so you're only a download away from having one of the smoothest, best supported AOSP ROMs on the planet.
It could oftentimes be unstable and not properly tested, lacking any changelogs, but eventually evolving into alphas, betas, release candidates, and finally stable releases.
Of course, if you do decide to give this a go, you're going to need the appropriate version of GApps, as well. Grab those right here, and flash the .zip after the ROM.
Welcome to the fold, Ion owners. Enjoy.