As I said - and I think that somebody at HMU must have realized this too, since they're going to release both M6s in the same month - you're getting two radical Mahler 6 recordings here: one extremely slow, and one extremely fast. We've already had Barbirolli; Chailly; Sinopoli; Segerstam; Gielen (just his first two movements are slow) give us slow performances that are very good. But we haven't had an extremely fast one in a while; probably not since Jarvi (Chandos). Given a choice between extremely fast or extremely slow, I'm probably going to gravitate to the fast one.
I just think that if somebody wants to hear the 6th Mahler played by the big guns of an American orchestra, I think they should stick to
Eschenbach/Philly or MTT/SFSO (even that's hardly my favorite). I don't mean to be hating on Haitink, but I just don't hear any improvement from him. He has one very good idea in the finale, which is to slow down at the (false) victory parade march tune, towards the end, and have the horns blast out the march melody at a full fortissimo. However, he should have also realized that the passing marching band needs some drummers as well. I agree with Hurwitz's opinion, that some of the percussion simply got left off when the revised version was printed. But that's just an opinion - we have no evidence of that.
I think that a far more creative idea - especially in S/A order - is to do it the way that Gielen did: make the first and second movements slow, dark, and ponderous, but then take the andante moderato and finale more up to speed.
As for Gergiev, check out the little video promo for the LSO Live Mahler cycle. I like what he has to say, and I like how the excerpts sound. Obviously, he's going to be too fast with the symphony's initial march (and I like Haitink's slow tempo for the initial march), but he's going to have the inner movements up to speed, and the outer movements will be fast and exciting as well. Given the sort of dry, staccato sound that the LSO usually get, along with the dryish acoustics they often play in, I think that faster Mahler with them isn't a bad idea at all. We'll see. Obviously, fast tempi are going to work better in same works and some passages, than in others. The first movement of his 7th will probably be too fast, but the finale could be sensational. We'll have to wait and see.
Barry