The biggest thing for me with the xl is the hot swappable drive bays at the rear - being a photographer it will come in handy with my new 6tb drives going in soon.
The normal 011 was a no go as my gfx card wouldn't fit in the conventional way and if I had a vertical riser kit then it takes away a rad.
I'm going to find out tomorrow if i can fit a rad at the bottom. I've ordered a TX360 20.5mm thick rad for the bottom. I measured if i moved the vertical bracket up 1 slot i could squeeze the rad in... it will be tight but it should fit just fine. That'll give me a total of 240+360+360 radiator capacity. If it works then i'll look at replacing the top rad for another 360 as well.
Currently looks like this: