First, I really enjoyed this film. If you haven't seen it then go see it. Anyone who enjoyed X-men First Class or the first two X-men films will love this one. I will be very careful not to drop in any spoilers, so don't worry if you haven't seen it yet.
The film is set in two periods, present and the 1970s. In the present, mutants are on the verge of being wiped out and Logan/ Wolverine is sent back into 1970s, via a mind transfer process. For anyone who remembers the first trilogy, this film has been done to reset the timeline and effectively wipe out the third film which has been regarded by fans as a complete disaster. While the function for this film is the back peddling of a film company after damaging the franchise it doesn't in anyway damage the film created. The story line feels plausible and not forced to conform to it's purpose.
The younger characters, introduced in First Class, play the major roles in this film with their present versions more as cameos. However, there are some very good fight scenes in present line which introduces new mutants which I would love to see in later X-men films. I particularly like the one with the portal powers, which made for some very fluid and engaging fight scenes. The characters of the younger Charles, Magneto and Mystique have really been expanded in this film. A much deeper insight is given into their emotional/ mental struggles and the events which lead to them into becoming the characters of the first trilogy. There are also brief glimpses of other first trilogy characters such as Toad to watch out for.
At a time when action films are becoming all action and no plot, I found this film very refreshing. There are plenty of action scenes and yet not so many that the plot feels drowned out by them. The pacing of the film is kept up without any loss of meaning or direction in the film's plot. This is a wonderfully balanced film which does it's purpose of wiping out the timeline of the third movie without the feeling of that being its only purpose of existence. I will definitely be getting this one on Blu-ray when it comes out.