I have five Bosch Colts and haven't had a real problem with any of them. The only issue I have had is the shaft lock used for changing bits doesn't hold on one of them, so I have to use two wrenches like I do with most routers. That isn't a big issue for me because I have them set up for dedicated tasks, so once set up, don't need to change them anyway. I do have one of the PC 310 trimmers with a lot of usage on it, but don't really view it as being any better than the Colts. I also have one of the lower-end PC trimmers (don't remember the model) but don't like that much because of the way the base adjusts.
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