I guess they are OK for classical, especially smaller ensembles with lots of acousitical instruments (e.g. chamber music, solo violin, or cello, etc.) - although for acoustical material, I really prefer the rich, textured, organic tone body of the RS-1's that their wood chambers impart.
But... you may find them a bit "laid back" if you're not seeking a "laid back" sound, but a more forward, aggressive sound. If you're after a more forward, aggressive, more detailed sound, you'll need to make sure you're other components mate with them well, and you have the Zu cable upgrade, or possibly the Cardas (which is just a bit warmer than the Zu). Both of these cables brighten them up a lot, and give them a more forward, aggressive, detailed, textured sound - the Zu moreso, than the Cardas.
And... most of the reviews, I've seen suggest, the K701's may be good with classical, because they reportedly provide so much more detail and separation, and are inherently brighter.