The building itself is quite cool. Its an eight storey, circular Perspex edifice with gigantic posters trailing the latest blockbuster alternating on the outside.
The sound is excellent, both in terms of volume and quality. You may want plugs if you have sensitive ears, they definitely have it turned up to 11, but the system is up to it and the quality is good even at that level.
The screen is vast, the largest is the UK, 540square metres of it. The 3D quality is fantastic for those films made for it, in fact, some specialist films can only be seen at their best in an IMAX cinema. However for normal 3D films the quality is only a little better than your normal multiplex. Actually to be accurate it is better in the centre of the screen but can seem a little blurred at the edges. However the experience is far more immersive because of the size of the screen.
It is not cheap, our tickets were over £20 each last time we went. The seats are not comfortable enough to sit through a full movie easily. There seem to be too few toilets for the size of the venue, each time we have gone the queues have been long before and after the film.
However having said this, it is a unique experience and it is worth going at least once to see either a made for IMAX film or a big 3D blockbuster.