I find the EFB a fantastic tool & apparently I am now a grumpy old one. I put in the ambient details, adjust for reality (increase in temp of day, fall of press etc) & execute. I have the flexability to look at differant r/way & power options. The company & I have confidence in the system & each pilot works very indepedantly until we come together for the final answer. Our EFB gives the rtow, so payload answers are easy, & speeds. However its good not to loose sight of "the feelin or experience" factor. Younger chaps dont understand Bullsh#t in, bul out. BOAC is right, paper version takes 1 min when you know it, guess this gives me confidense with EFB. Old git I have become