I had the original OnePlus One. Then the two came out and I needed 2 SIM cards. Then the 3 came out.
Many people with my handmedown phones.
All love them. The best feature is the camera quality and battery life. With no bloatware, the phone goes forever. And the 3 charges from 30 to 100% in 30 minutes. A quick top off before your flight and you are good for two days.