Bests & Worsts Reviews from Amazon

I received this about a week ago and used it to charge a pick-up battery. I took it out of the box, hooked it up, and then tried to use my intuitive sense to turn it on. It did not seem to charge correctly, so I read the provided manual--which is difficult to read and understand. "On some settings, you may have to select and then hold 3-5 seconds." Well, which ones? After I read the manual twice, I think I understand how to use it. I say "think" as I am not sure. I found the manual very marginal. I then went to the NOCO site and found a data sheet, but no instructions. It is the weekend, so no chat available. It did take 16 hours to charge my battery, which seems a bit long for a supposed 10A charger. That is also what the chart showed for the charging time (17.3 hrs). What do I like? It is supposed to charge all types of batteries I use, it is compact and rugged. All that said, I hope this becomes my favorite charger once I am sure I am using it correctly.