I recently had this dilemma - M/L or Jumbo. This was my first Chanel purchase (and last if my husband has anything to do with it!)
I found this thread really helpful in deciding which one to go for - the majority of people seem to say that M/L is great for evenings and smart events, whereas the Jumbo is perfect for everyday use.
Personally I wanted the bag for evenings and weddings, when I don't carry very much in my bag. Therefore I decided to go for the M/L in black caviar.
I hope I made the right decision! Maybe one day I will be able to get the jumbo as well....
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