I find myself in possession of two editions of Assimil's Spanish course with a third edition on it's way. Namely I have the 1957 edition of Spanish Without Toil, and the 1987 edition (actually recent printing) of Spanish with Ease. I also have ordered, but have not received, the new English base version of L'Espagnol directly from Assimil. The 1957 and 1987 editions are definitely different and I believe the as yet unreceived L'Espagnol is also a new different text. All three have an English base. I am tempted to do one lesson from each edition every day.
Has anybody tried to work with multiple editions of Assimil in parallel? If yes, was it helpful? I suspect that eventually my enthusiasm may wane a bit but I think I can keep this up for 5 months or so.
Would this be helpful? Am I confusing myself? Will I hate the name Assimil by the time I am done?