I used my shaper to run about 60 LF of 3/4" shiplap for a cabinet back this afternoon. I cut a 3/8 x 1/2" rabbet in both edges, so two passes on each board except the two outside boards. Before I had the shaper I would have either used the table saw and dado blades (one pass per rabbet) or a regular blade and cut two passes, face and edge, or the router table and made multiple passes. With the shaper, once I got it set up all I had to do was feed in a couple of trial pieces, tweak the fence and feeder, and then feed in each piece, flip it over and repeat. After running the first two pieces conventionally I reversed the feeder for a climb cutting and it cut MUCH more smoothly; no tear out at all. The downside to climb cutting is it's really messy. Lots of fine sawdust everywhere. I put a magnetic chip deflector I usually use on the milling machine on the table to redirect a lot of the sawdust, but it still made a mess. Of course, if I had it hooked up to the D/C, the mess wouldn't have been as bad....
Anyway, it was a lot smoother and probably safer than cutting the rabbets on a table saw, and with the climb cutting it was a lot cleaner, too. Other than messing around with the initial setup, I'm really starting to like the shaper. Doors and raised panels are next.