Love my Protank 2, even more than my 3, cheaper coils. I also saved all mine untill I was ready to try rebuilding. I like mine around 1.5 ohm, but it depends on what battery your using if its a variable volt or just a set voltage ego. If it is a regular ego I would go with 1.8 ohm. if you have a v.v try it at the lowest and work you way up untill it right for you if you go to far it will start to taste burnt. also if later you want to rebuild them, its easy and I also think it's better than the stock silica. I tried the prewrapped coils from fasttech 50 for like 3 bucks and use sterile cottenballs for the wicks. although if you decide to make your own just make sure you know how to test with a ohm reader or tester.