My sons's birthday is just before Christmas and despite the shortage we were lucky enough to be able to get hold of one of these Batcave's in our local Toys R Us. It might be of interest to note that the tall model shown above is the latest version. The smaller version that you can see on some websites is the older model that was discontinued over the summer.
We already have several toys from the Imaginext range. They are all built like tanks and my son adores playing with them for hours on end. Once the Batcave is released from its packaging there are a couple of bits to clip on, but it's basically fully assembled. My son is 5 years old, and when he's on his knees playing with his Batcave, it's as tall as he is - a substantial toy. There is a gun that fires a missile, a crane arm, a prison cell, a telescope, a light up batman sign, a lift that goes up and down, a turntable for Robin's bike... and probably a lot more that I've forgotten to mention. In the words of my very excited son, "there's just so much to do, Daddy!". The set includes the Batcave, Batman and Robin characters, a missile for the launcher, a bike (which fits Robin only) a couple of tools, a bat computer and a pair of clip on wings for Batman. I can't begin to tell you how pleased my son is with this toy. His face lit up like you wouldn't believe when he started to unwrap it.