Depends what you by 'after a while' . For me, i recently 'blind bought' Acca Kappa Cedro. After the initial application i though ..'hmm not bad at all'.....half an hour later....'don't think i like this'......after an hour all i could think of was 'pencils'......consequently, i started to feel nauseus so i went straight to the bathroom,used my habit rouge soap and had a good scrub. So yes, i have myself regretted many times purchasing fragrances i think i may like.
Acca Kappa-Cedro ( the opposite is their white moss..what a fantastic fragrance!)
Floris-Elite ( This is a box set i bought...includes EDT,shower gel and shampoo)
Thinking about giving this away.
....and numerous others i can't remember at the moment.
This xmas i've practically spent a small fortune on scents....namely acqua di parma colonia, EDT,talc,soap etc ( awesome classic scent!)
My very recent purchase is Habit rouge cologne....
Hope you find that detailed enough