I bought this as it reminded me of a research vessel I worked on back in 2007 called RRS Discovery. The model itself is really impressive, and big, once it is completed. I spent about three days on it, building after work. It is a challenging build, which I like, and its great to see the scale of the ship increase, as you add the fore and aft sections of the hull and finally the bridge. The designers have a done a neat job with the rear rudder and on-board crane, and the way this moves by turning the small screws on the roof. The little helicopter is great fun as is the submarine, especially the moving propellers and sub sampling arms. My only gripe is the heli-deck; it's far too big and high for this type of vessel; usually it would be on the rear. I therefore modified my model to lower the heli-deck, and put in a replica rear sub-launch derrick on the back. I also added seats in the submarine and helicopter to make them more realistic. I've added photos... This is superb value at this price point. Recommended!