This is one reliable driver, IMO. I have had one ITB for about 6 months, and I've barely looked at an alternative (which is rare for me).
The head is very forgiving, right across the face, and it takes a bad swing to be severely penalised in terms of distance. I have it shafted with the ProLite 35 Stiff, which is a long time favourite shaft of mine, and I find it a nice match to this head.
I find that the head plays reasonably true to loft, with this shaft cmobo, maybe just a touch higher. Spin rates seem spot on for me, with my SS in the 105-115 range.
Distance is fine, with a nice hot feel from the face. I find the distance is consistent, which is something I like. It is rare to get one that disappoints, or that surprises me, either. Very reliable and predictable.
Feel is a little on the muted side, with feedback being less than ideal, but still pleasant feeling, nonetheless.
For me, the 540XD is a great compromise, with distance, forgiveness, good launch characteristics, and decent feel, all wrapped up into a solid and dependable package. It remains ITB. (for now

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