Hi sue, welcome! What problems are you having? I’m on my first modern device with a GTI coil and I love it. Can’t wait to try the other one I have but the first one has lasted very long. 11,000 hits and almost 2 months and still kickin. Wanna get more but not sure if I want to get the .4 or .2 ohm. The .4 has been great so far.