I worked in a cutlery store handling many different brands of knives and all kinds of locks. After a while I realized why I was getting annoyed with liner locks: it seems to be the easiest locking mechanism to do badly. In some knives it also seems susceptible to pocket lint at the locking faces. There are some excellent ones; Al Mar SERE, Lone Wolf, and Chris Reeve knives come to mind. Yes, they are all expensive.

Most people I worked with ended up with a Benchmade in their pocket. I got the Ritter mini-RSK.