I recall reading somewhere some comments Air Chief Marshal Harris made about the Halifax. I get the impression he more or less tolerated the aircraft being on strength with Bomber Command because they needed numbers, and quickly, until the Lancaster came along. He called the Halifax "a typical Handley-Page product," but I'm not sure what he meant by that. I do remember hearing the aircraft as originally built, with the triangular vertical stabs and square wingtips, had wicked stall characteristics and not too great directional stability. Fining down the lines (eliminating the nose turret, general cleanup, etc) plus adding rounded wingtips and larger vertical stabs helped a lot but it was never as popular within the command's ranks as the Lancaster. Interesting statistic - I do not know the percentages for the Stirling, but more Halifax pilots survived bailing out of a stricken aircraft than Lancaster pilots. I've also seen it averred the Lancaster was structurally stronger than the Halifax. If you put these together, this means if the Halifax were hit it would burn/fail before the Lancaster would, but you as the pilot would have a better chance of escaping the aircraft; if you were in the Lancaster, the bird would hold together better if hit, giving you a better chance to make it home, but if push came to shove, you had less of a chance of surviving your shoot-down if you were the pilot of the aircraft!