I think Rumba is now owned by the Ted Lapidus brand. I have a bottle of Balenciaga Rumba, and just recently an SA gave me a bottle of Rumba in a white tester box as a gift, and Ted Lapidus is printed clearly on the box. The bottles look the same except that one has Balenciaga printed on the front and the other has Ted Lapidus. Also, the gold plate on the top of the bottle is stamped with TL instead of BB and the Lapidus bottle has a clear sticker on the back listing ingredients and other information. The juice in the Lapidus bottle is noticeably lighter than the juice in the Balenciaga bottle.
After doing a quick comparison, I think there are differences. The Balenciaga starts out sharper but becomes very full, fruity, floral, and dark. The Lapidus starts out softer, and while the two become more similar after a few minutes, the Lapidus seems lighter, fresher, not as dark and rich as the Balenciaga. I can't say for sure but I think there has been some reformulation of Rumba. Neither can I say whether this might have happened in Balenciaga's hands or after the rights were transferred to Lapidus'.
I like this fragrance, and my familiarity is with the Balenciaga version, not the Lapidus version. It is very fruity and floral, nearly over the top at first, but as it settles down a tart, dark, plummy, woody backbone comes through, preventing the fragrance from staying overwhelmingly feminine. It flirts with powder for a while but I do not consider the drydown to be powdery.
I'm on the fence about Rumba as far as wearing it. Yes, I wear it at home occasionally, but so far I haven't worn it outside. Sometimes I think it would be fine, and it probably would be, but other times it seems too florally feminine and a bit too fruity to me.
Let us know what you think. I hope you got the Balenciaga version.