I used gentoo for years because i did like the rolling releases and that i can install most stuff with one command even if itīs commercial stuff, but it takes to much time for me. Its not just the compiling, there are conflicts file collitions, managing masking and useflag lists... its ok if you want to learn much about linux but not if you dont want to invest to much time for it all the time. As example kernel updates, even with genkernel it takes to long to get it running and booting, also sometimes the compile times stinks.
So i went to Ubuntu last years (used debian before i went to gentoo), the 6 month release-cycles are aceptable even if i use since a few months karmic But there are not too much problems.
But i like to have a linux where i can install very new stuff without the possability to brack my main linus, so i installed arch linux yesterday in a kvm vm (is that redundant ^^) and I liked it, so I moved it to a lvm lv (again?) on my system-raid and made it bootable (directly outside a vm). Most stuff is very basic i think its because its a very young distribution? Most stuff is very basic and the installer just gathered lvm and mdadm support. But you have in less minutes a running system very less configuring a good wiki and no big edges so far.
I think its a good second distribution, if the gentoo devs donīt change much i will not look back. Maybe someday i try out again a saboyan or funtoo (have installed it in a chroot, but with no kernel, uses git for syncing portage that makes it 2-3x faster) but if the kernel-configuring compiling will not be made fully automated (optional) and some other things change. its not worth for me.