Anyone interested in German tanks and the Tigers in particular should read tank ace Otto Carius' memoir. Really interesting stuff, there are a lot of armchair generals that like to talk about the good and bad of panzers but it's good to get the perspective of someone who lived and fought in them for years. Tigers were a lot more reliable than most people claim and were generally beloved by their crews, while the later King Tigers and Panthers were much less so. Probably their biggest flaw in the crews' opinions was that the batteries tended to lose charge and not be able to start the engine if it stalled, forcing them to bump start it by being pushed by another tank, or far worse, get out and crank it by hand or hook it to a tow vehicle.
The Tigers in this photo are early models, later models had the cupola hatch designed to open to the side instead of upwards to make it less obvious that the hatch was open.