Once I actually did miss and once it cost me a Eur 20 taxi to prevent that I would miss my connection. Al because of the travel connection between the Terminals and incorrect information about connecting travel also arriving at T2, instead of actually T4. Travelconnections directly to T2 should be better and the free connection between the terminals should be much faster (not actually taking almost half an hour, including wait time, unacceptable). Communication about how you can arrive directly at T2 should be much and much better. Furthermore Eur 20 for a taxi between Terminals is a rip off. Barajas should do much and much better.