If you're looking to own a number of recordings of Mahler 3 this is well worth considering and has much to offer, not least a generous and intelligent coupling. Having said that it is not one of the very best Mahler 3s, nor one of the very best in Rattle's Mahler cycle. Although both playing and recording are excellent, the performance doesn't flow as well as the best and has one or two idiosyncrasies that will irritate on repeated listening such as the slowing of tempo in the very opening at the entry of the percussion and the woodwind glissandi in the 4th movement.
If you want the best I would opt for Abbado from 1982, the classic Horenstein from 1970 (good sound for its time but behind today's standards) or the somewhat cooler Boulez from 2002. Also worth considering is the live Haitink with the Chicago Symphony Orchestra on CSO Resound (recorded October 2006, released June 2007). This is very powerful and flows beautifully all the way through with outstanding orchestral playing, particularly from the brass. It's too early for me to say if it sweeps the board, but it just might.