As with all of the Cortot editions,they are extremely useful for learning the works of Chopin, but should not be your primary score.
The best urtext editions are published by Henle.
If you are studying the Etudes, this collection is a must have, the technique help by Cortot is invaluable - his advice and exercises are similar to what any Chopin expert would illuminate to a student.
- Usually ships in 1-2 days -