It's a pretty good film ,then. But - and from here on in spoilers abound - there was one thing about it that left me a little perturbed.
So, the basic idea of the film is that each time Gagglehill's character goes back in time, the system is actually creating an alternate reality, so nothing he does in that reality "matters" from the perspective of "his" Earth. What he learns can be applied, but that's all. At first, this is presented as a theory, but it seems pretty much confirmed by the end of the film , though if anyone took something different from it, I'd be delighted to hear about it.
Here's the thing, though. Once you buy into that theory, it immediately follows that every time - every single time - Jake jumps back, he creates a new Chicago in which two million people die. This film has an off-screen body count in the tens of millions. Indeed, in the final minutes, when Googlehell is begging to be allowed one more jump to save the woman he met this morning and is now desperate to save, he's actually saying "Let me risk two million new lives so I can screw that chick from Kiss Kiss, Bang Bang".
Seems somewhat less romantic put that way, doesn't it?
Of course, following this thought to its conclusion leads to all sorts of ethical madness. Like, if you create six billion new lives knowing two million of them are going to die almost immediately, is that necessarily a bad thing? So I'm not saying there's necessarily a massive moral problem with the film. I just thought it was worth mentioning.
 And how different would the film have been if Jake had kept leaping into the body of a sweat-drenched mouth-breather Monaghan was desperate to ditch?