Nipples make the best waterers. If the chicks are not getting enough water then they will be hanging around that waterer all the time. If they are doing normal chicken things then they are fine. To start chicks or chickens on nipple waterers the only thing you have to do is take away all other water sources. Within a short time they will be attracted to that red plastic and the shiny metal and start to peck. Once one figures out water comes by pecking, they will all figure it out. I use horizontal nipples. They stay thawed out better than vertical nipples in Northern Montana where it gets quite chilly during the winter. Using a tote with lid, horizontal nipples, and a stock tank deicer rated for use in plastic, my water has been thawed even when it was -22 F outside.
Most of us who have chickens have used all different feeders and waterers. Eventually we find a system that works well for us.