Gill appears to struggle with some quality issues. If you are lucky, you get a good battery, but if you are out of luck, you might fetch a bad one. Odds are uncertain, but I had a real good one for many many years, had to replace it and got a bad one which only lasted less then two years. As I was uncertain on the alternatives I again got a G-25 and this is a good one, now serving for two years without issue. Heard of many switching to Concorde, but did not hear long time experience up to now, so please keep us posted.