I have both Skinny products, and Schiesser ordered. Skinny fit in Gr. L is not (am 1,88m tall and heavy 75-78kg) - that was so narrow cut, is not (normally I wear size M.) Schiesser however, went well (have deliberately ordered Gr. L, so that the back is long enough). The fit is like a long Gr. M, perfect for me! The back is long, comfortable to wear.
About long-term experience, I can not say anything!