I had a CA300 for many years and had no reliability problems. Same for the DR-10 that I owned for several years before that. Acording to my dealer, after I bought my CA300 in 1995, Classe modified the amp to make it sound more impressive in the showroom---sharper highs I recall him saying---but overall less natural in his opinion. He later said the CA301 was voiced in a way that took it back to the original CA300.
I don't have any experience with more recent Classe gear.