Hey Rami,
I guess it depends, are you doing this for yourself or do you plan on marketing it? CS 5.5 wasn’t bad, I think it had an issue where it inserted an extra space in the DTD line in the xhtml files on export which caused an issue with ePubCheck validation, hopefully they fixed that by now. I believe it only exports EPUB 2.0 files, which might cause issues if apps stop recognizing the toc.ncx file, then you might have to convert it to the EPUB3 spec to work.
Aaron