I have a copy of Zinman's new M10 on order from Presto (England). However, I did get a chance to hear a burnt copy of it just yesterday - twice! In my opinion, this is a very special Mahler recording. It differs somewhat from the fine Litton/D.S.O. (Delos) one in that it's slightly slower overall (but proportioned much the same), and it's much more detailed in respect to just exactly what Carpenter does in his orchestration. Litton may be slightly better with the overall flow of the work (emphasis on slightly), as well as being better at disguising just how radically different Carpenter's pastiche composing and orchestration actually is. Zinman, on the other hand, is unapologetic (sp?) about this being a Mahler/Carpenter joint venture.
The sound is absolutely stunning on this, and the playing is almost as refined and confident as it is with the underrated Dallas Symphony (keep in mind that this is an extremely difficult score).
For those of you who are not already familiar with the Carpenter version, try to imagine a performing version that might be a collaberation between Alban Berg and Luciano Berio. In other words, I hear elements of both composers in Carpenter's work.
Overall, this release strikes me as a true labor-of-love from David Zinman, and I can fully understand why he might not want to bother with "Das Lied von der Erde" - much of Carpenter's version strikes me as having the same sort of quiet concentration and focus as "der Abschied" from "DLvdE" (then there are those Bergian outbursts from time to time, complete with independent timpani and bass drum parts). If you're at all curious, do try to give yourself a chance to hear it. While I'm not convinced that Carpenter has the final word in regards to Mahler 10, I'll be keeping both this and the Litton recordings.