JohnT, I wouldn't mind spending $450 on a charger that I was guaranteed it would do the job in a week or two. I would move around and freshen up all my batteries.
I'm not the least interested if I spend $450 on a charger that I have to leave on the battery all the time.
So do you have to keep your charger connected all the time?
Do you ever load test them to see how much good it's doing?