the crossbow is a pain but I managed to get mine working reliably with a bit of effort but wouldn't miss it - I don't agree with Bicycle girl. its another way to get into multi-kill which is worth the risk/reward for that; the other things it has is the lights which in Horde mode and blood bath really add to the environment of the game.
Cheers,
Neil.
Bicycle girl and it's associated multi-kill is in the Pro too - very good to stack CDC mode as I think they are both 3 shots around the ramp on the Pro (maybe 4...?)
+1 on the light show, if they do the upgrade kit (although expensive) I would add it and in my honest and personal opinion, it would be the perfect version... (with Shaker Motor, Some LED modding to Prison, Blood Bath, Invisilass and that backglass @robotgreg had that I will get some day).