I'm always looking for new distros, so this post really pleases me. I didn't even know there were other linux bronies around.
Anyway, I found a really fat distro, (4gb for the OS alone), but I really like it. I
t's called Ultimate Edition, and It come with a plethora of interchangeable desktop environment. (Say, you get board of Razor, boot up Arch, or whatever else I got). Ultimate edition also comes with TONS of preinstalled programs so you don't have to go out and get them yourself. It runs just fine on any sufficient computer, and comes with a smooth installer from it's site. I got it to run alongside a windows 7 OS on a 2 TB drive, (Windows for gaming, Linux for using). If you like being able to customize EVERYTHING, than Ultimate Edition gives you it all. (Plus no programming needed to swap Desktop Environments, yay)
The downsides are shockingly few, actually.
It is the biggest distro I've ever found, and thus could be unsuitable for the average computer. With each desktop, you are given a blank slate, but It really is square one. You gotta learn the ins and outs of every new desktop Environment you test, which can be intensive. (I prefer Razor, but I've only scratched the surface.)
I put a lightweight Ubuntu on my old Netbook , and It's running like a champ right now, considering it's previous condition (It ran Windows XP on 2gb of , poor thing). Not much to say there, pretty basic.