@Aenea
I don't know much about Linux Kernels (or anything to with Linux actually...^^) but I had heard about the Power-Saving features, and since I'm the official specialist "Startup-Time and Power-Saving" complaints that was my main reason for suggesting this.
In Addition, I have heard complaints about missing support for certain features in the "old" Kernel the Iliad uses at the moment from some of our other developers, but really can't give you any details without going deep into the archives of mobileread and searching for them by hand...
If you tell me that there are serious drawbacks to staying with the old Kernel, then I certainly won't contradict you...