The buttercream colour is luscious, and the chains on Lilys tend to hold up very well ( I have 2 mediums), and the chains still look impecable, after a reasonable amount of wear and tear. I would disagree with anyone who would claim they look cheap. But taste is subjective. As long as you like the bag ( which you would be right to, the buttercream is a beauty) and buy it from your own money, it's your decision alone. Wear it with pride!
I imagine the Medium Lilys are incredibly useable, for day and night! That's why I'm leaning towards the Medium rather than the regular. What colours do you have, may I ask? Do you have the buttercream?