I love my Sirius chargers. I dropped mine and broke the switch. I called them up and the guy said, "Can you solder?" I said yeah and three days later there was a free switch in my mail box.
In the mean time I had purchased a second charger that it now hooked up to a deep cycle golf-cart battery. I keep that one in my car for field use and the other one lives in my shop.
I've got nothing but good things to say about these chargers. Of course all my batteries are less than two years old, but they cycle above their rated capacity and I've had no battery failures.
Hmm... sounds like new material for my web site.