Interesting thread. I have taken one Vueling flight and positive experience - pricing was powerfully connected to options chosen and flight experience good as LCC.
I had booked my flight on Vueling. The interesting question for me as possible future traveler on Vueling is that do I get any miles/points as oneworld AY member if I book IB flight which is Vueling metal? I understand Vueling booking on the same metal will at least give 0 miles for sure.