I bought the set of 5 for my Aspire K1. Two coils each have ca ONLY held for 2 days, even to clean it with alcohol and then drying. The third coil I just use keeps strangely for 1,5 weeks. But overall I am disappointed for the price! Such fluctuations may Qualitätiven my opinion, not because you might as well wrap itself.
Next, I'll try the BVC coils, these hold at least Aspire Nautilus 3-4 weeks.