The Final Verdict
You have to stick with it and concentrate otherwise you might get lost but if you do you will be rewarded with one of the most intelligent, inventive and exciting sci fi movies for many a year. In my opinion it is the best time travel movie since the brilliant Twleve Monkey's and may even be on a par with that film. Another gem to add to Bruce and Joseph's already impressive filmographies. 4.1 out of 5 for me.
Finally, while we are on the subject of time travel I just wanted to finish with a little anecdote about a time travel related conversation that occured at my place of work last week. One of the guys in the office asked the question of where or when in time you would go to if you had access to a time machine. One guy answered instantly. "Dinosaurs! I'd go back and hang out with them and stuff." Good answer. Another guy thought about it for a moment before replying "I'd probably go back and see if Jesus really existed". Fair enough. "What about you Becci?", the inquisitor asked. Becci pondered for a moment before answering. "Well I think I'd probably go back to early 1990's Edinburgh." "Really? Why?" "Because the flats were a bit cheaper then so my mortgage wouldn't be as expensive." Live the dream girl. Live the dream.