My 2.5 year old son received this for Christmas. We bought it from a store in the High Street, but later I checked the reviews on Amazon and was not impressed. In fact, I was thinking that maybe we should return it and get something else instead. However, I am glad we kept it. It is actually a lot of fun and I don't find it particularly difficult to put together. The first time we set it up was on Christmas Day at my parent's house - to be honest, it was a little precarious and did fall to bits somewhat. I know now, though, that this was because it was set up on carpet - after taking it home and setting it up on floorboards I have found it works perfectly and is pretty stable. My son uses a battery Red Mighty Locomotive Brio train on it, and as long as you set it up properly, it goes up and down with no problems. I don't know how stable it would be if you used the push-along trains with it - I imagine it may get knocked over much more easily then. In my opinion, this toy is much better suited to the battery trains anyway, because otherwise your child would find it more awkward to push the train round the lower level. The battery train is great fun because it speeds down the high hill like a rollercoaster! My son loves this aspect of it the best. I can see from the other reviews that other people have had problems with this toy, but for us it is definitely a fun asset to a train set. I can't see any reason to glue it together if you are using it on a flat, hard surface with a battery train.