First is to say that I own 4 other versions of the Tchaikovsky concerto:
Heifetz/Barbirolli/London Philharmonic Orchestra;
Oistrakh/Konwitschny/Staatskapelle Dresden;
Perlman/Leinsdorf/Boston Symphony Orchestra;
Mutter/Previn/VPO
so I kind of know this piece very well. Maybe these are not the best but they are the ones I could get along the years. Each set has something good and something I dislike, being the sound quality a clear let down in the Heifetz set since the recording made in the 30s was not really improved IMHO by EMI in the 2006 remaster. Also the mono sound in the Oistrakh set means for me a not fully satisfactory experience. The sets I like and that I play more often are Perlman and Mutter, not only because of a better sound but also because the orchestra is not shaded by the solo player and you can hear both. I think Mutter is better in the Korngold that completes her set but still her Tchaikovsky is good. Perlman's is fantastic I believe.
Then having listened only to Hahn's Bach album, I decided to buy this set and I was really surprised. Maybe the reason that the concerto sounds SO different is because it's the original, uncut version (as said in the booklet). Or maybe it's because Hahn somehow plays each note as if she was savouring their flavour (as you would do with a delicious cake) so we can taste it with her. The playing could be not as fast as in other versions but I don't think this means it's less virtuosity. Quite the opposit. Hahn's playing sounds as clear as a bell and her pianissimos are awesome. As awesome is Petrenko conducting this orchestra (so good now!) for not shadowing Hahn's soft playing and still managing to let the orchestra shine.
By far, the best version of Tchaikovsky concerto I own. Will be played often and enjoyed for many years to come.
The Higdon concerto is a world premiere recording so nothing to say there. It's a contemporary concerto but it has some clear lines that go back into more tonal music I believe. It's not as atonal as Berg concerto I think. Well I really don't understand these differences very well and I talk of what they sound to me anyway. I liked it.
I would recommend this CD, even if you think you have the BEST version ever of Tchaikovsky's. Try this one. It's different, but it's as good as the best.