The model 10 should go into the history books as the Peacemaker of the 20th Century. Before the fascination with large cap semi's, it was found in more police holsters than anything else. Good ergonomics for most folks, accurate, and reliable as all get out.
The price is a bit on the steep side for most areas- for that price, would expect something in the Excellent grade. Ref: cylinder release- make sure ejector rod is not coming unscrewed (they get longer when thread is backed off a turn). may need drop of oil on ejector rod. You should be able to hold in right hand, press latch with thumb, and with left hand under gun, palm up, use fingers of left hand to push cylinder out- leaving thumb in position to push the ejector. Never slam or flip the cylinder open or closed. There were about a million of the Model 10s that were police dept trade ins.