Studies show almost all subjects regained the weight and reversed gains within 2 years. This means underlying issues (e.g., food addiction) aren't being addressed. Short of changing habits, the only maintenance solution is lifelong drug use and that doesn't sit well with me.
In my case I just weight myself daily, track the weight and scale my food consumption with the current trend. If I'm gaining weight I'll skip a meal.
It takes a while to figure out what works for you but I can tell you that making small lifestyle changes to maintain your weight is fairly easy compared to figuring out how to lose 10 kg.