My first was an Njoy...didn't stay on it at all.
I'm cheap, so after buying my box-mod from a friend, when the switch died, I made a new one. Atty's are not too expensive, and couple this with either one of the box-kits at MadVapes or brew your own you can get vaping for under $30 in hardware. Juice will be up to you, but I didn't start making my own juice for a few weeks.
Welcome to Vaping (Actually, you probably have been for a bit) and enjoy!