I have only bought one Chambers flintlock. It was the Gunmakers flintlock, as I had to fit an existing mortise for an antique gun. The lock worked very well.
I have to say I really like the L&R Bailes, and the Durrs Egg. Mind you if you are going to use them with a single trigger set up, you will have to work on them, since they have a deep sear engagement with the full cock notch. The ones I've used with set triggers, I haven't encountered any problems with. Of course you need to look at the way they are put together. If you don't like the way it is assembled send it back.
As far as their service I have nothing but praise for them. In the past year they have replaced two cast mainsprings on older locks, and both were handled as warranty. They did not need to do that as I said they were older locks.
I have used Davis version of the Ron Long locks, as well as Ron Long locks. Very pleased with them. Larry Zornes M&G classic and Continental locks I really like as well.
Bought a couple of Beatles album, but happy to say I never bought any Springsteen.