I use a Dremel router attachment for fine inletting. It works and works well. However, I will not rout to the final line; for this I use inlettng chisels and gauges. So, it's mostly for stock removal. (For this, a set of hobby knives - Exacto - with modified blades, works even better than chisels and gauges.)
Where this little attachment shines is for inletting the lock parts into the stock. Much more accurate work is possible than with hand tools.
You will also find your work is much neater than with using hand tools. Especially in the lock area, you can achieve very good, flat finishes that would otherwise take hours of scraping and sanding to achieve.
Not only for lock work. This little router shines when inletting trigger guards, triggers and trigger plates; even patch boxes.
Router torque is about non existant, so there is little fear of the router 'running away' from you. But, as with all power tools: practice, practice, and then practice some more.
Also, the attachment is a little flimsy; so work kindly with it.