Bought this as a first lego kit for my 4 year old and he loves it. My 20 year old loved making the car. Its having the 'little guys' that makes it fun for the younger child. The army figures are constantly on a mission to find Woody or Buzz, driving around in the jeep. Good for role play for younger children and developing fine motor skills (replacing heads and equipment and sitting the little guys in their jeep). I found this works really well with the Buzz & Woody 'to the rescue' kit - the one with a model of the rocket & RC the remote control car from the first film. The model jeep is quite tough and durable, and not as fiddly as the RC lego model. A good first lego for kids moving up from Duplo or large bricks. The recommended build age is 6-12 years, so a younger child like ours would need lots of help to build it - I think a 6 year old would probably do it on their own.
As this set is quite generic - ie army guys that could be in any army guy story, I think it will go on having loads of play value even when Toy Story goes out of fashion. Lego have now sold out of this kit, so bag one while you can, the rrp is £9.99, pay no more.