Has anyone tried the Kanger Horizontal Coil Cartomizers (5pc Empty Kanger Horizontal Coil Cartomizer for 510/eGo - $4.58 : Healthcabin Electronic Cigarettes - Wholesale and Retail--)? It seems they might be a good choice for a bottom-feed application like the UFS since the coil is actually at the bottom of the cartomizer. I've got some coming, but was wondering if anyone has any experience with them.