I found the short technical report about Correspondence between exon and standard array. Researchers described the performance of Affymetrix GeneChip Human Exon 1.0 ST array by using replicated RNA samples from two human cell lines hybridized both to Exon 1.0 ST and to HG-U133 Plus2 arrays. Researchers concluded that fold changes are found well preserved for over 96% of probe sets detected present.
High correspondence between Affymetrix exon and standard expression arrays: Michał J. Okoniewski, Yvonne Hey, Stuart D. Pepper, and Crispin J. Miller. BioTechniques. February 2007, Volume 42, Number 2: pp 181-185
BioTechniques is free journal. You can download the report PDF file.