Do you (or anyone else) know the relationship between CS2 and Elements 4&5? ie is Elements 5 a slimmed down version of CS2 whereas Elements 4 is a slimmed version of PS8...and for that matter is CS2 a complete re-write and/or how different from a development of PS8.

As I still occasionally have to resort to Elements 4, which is evidently in deperate need of a re-write, is 5 worth considering given that I am not going to pay CS2 sort of money