Rented this recently, and its great fun! It seems to have been sneaked out with no real marketing push or fanfare, which is a shame because its up there with some of the best shooters out. The plot is very 2000AD (its a time travel conundrum whatsit with alternate histories and stuff) and the mechanics are a lot of fun to play around with (you can freeze time in localized areas and also age people and objects at an advanced rate). Freezing time around a group of tightly bunched enemies, dropping an explosive barrel (yup, they're in it) in the air in the middle of them, then firing a bullet into it and watching the result in slo-mo is a moment of joy that will stay with me forever.
Its short of being a classic, it riffs a bit too heavily on Bioshock for it's own good and some of the enemies aren't as well thought out, but the set-pieces are fantastic and the story really satisfying pulp sci-fi.
Anyone tried it?