To put its value into perspective:

For 50$ you get an 11 roll and a guaranteed 6 star girl.

Gem-wise 50$ nets you 64 flower gems, you need 50 of those to make one 11 roll, which probably grants you at most one gold unit.

So if you are a paying player, then yes this is definitely worth it compared to the normal stuff you can get. If you are a free player, well that's up to you if you want to pay 50$ for a 6 star girl or not.