Hi Soeren,
In my humble opinion, XP2 is not enough of a reason to start doing your own C41 development: the chemicals (around here) are very costly, short shelf life, and it's more difficult than B&W processing. You may as well shoot colour then, but still - why not use a good minilab close to you instead? If you're shooting 120 film, I would stick to a traditional silver-grain film. If your're shooting 35mm, well - 35mm C41 development is still extremely widely available everywhere in the world, so I would say the relative low cost and convenience of 1hr processing dictates that you should enjoy shooting it, and let somebody else develop it. I suspect this is
the reason for the existince of XP2 - for people who want to shoot real B&W, perhaps make real optical prints, but do not want to (or can't) develop themselves. Perhaps for the same type of people who scan their film, i.e. people not wanting to do any chemical work themselves. For that, it's great.
I myself primarily shoot Ilford FP4+, but two weeks ago at a friend's wedding I shot my first roll of XP2, and I am quite impressed with the film, it really is usable from ISO50 to ISO800.
Here is one of the images, exposed at ~ISO 50 (using an Olympus OM-1n and Zuiko 90mm Macro at f/2.0), and printed in the darkroom (5x7 inches, Ilford MG IV satin paper).
The grain is really quite fine when you consider this is actually an ISO400 film with massive head an shoulders on the tone curve. I also pushed this film to ISO1600 and beyond in really dark circumstances, and it did not too badly. I still prefer HP5 or Kodak TMZ P3200 for these situations, but as a one-film-fits-all solution it's very compelling, I enjoyed using (and printing) it, it's very well-behaved when in an enlarger.
This second image was exposed at at least ISO1600, unfortunately the scan I did was not great, lost some of the highlight details because I was in a hurry, but it's there in the print. This is at the opposite extreme of using this film's working range as I understand:
(Also OM-1n, and also Zuiko 90mm Macro at f/2.0)