This said, I totally agree with makeanote that Chopin Etudes are not for learning or acquiring technical skills. They are for fine-tuning an already very advanced technique.
If it is technical progress that you are looking for, learn Brahms' 51 exercises.
When practicing 10/2 I got real pain in my finger-joints, almost arthritis-like. Then I stopped practicing it and the pain gradually subsided. I never had such problems with 25/6, which I guess is also the more useful of the two.
Actually I disagree with you, and think Chopin etudes are an ideal way to learn technique - provided you have someone there to show you right vs. wrong.Brahms wrote his exercises specifically for his pieces, and his pieces were written in a way specifically to contrast the pianism of Liszt (which is the sister pianism of Chopin).Rosen also discusses exercise 14: "I can reach the span of a tenth, but I cannot satisfactorily play the finger-breaking stretches that arise from holding down the inner notes required by this exercise. Brahms must have enjoyed the suffering that this exercise causes to most pianists."I have looked at several, and really fail to see their use in the repertoire of Liszt, Chopin and pianist-composers descended from them (which is to say, most pianist-composers). Walter Ramsey