They are great! I am particular to the Keitech, or other ribbed swimbaits during the pre spawn because the water is colder and the ribs displace more water. All other swimbaits will work. As far as spawn and post spawn, they work just as great. Bass become very protective of their beds, and then their fry once they are off the beds, therefor swimbaits that mimic bluegills or perch become very successful because they are prime suspects in fry killing. When post spawn turns into late summer, I will still fish swimbaits, only deeper. If the lake you are fishing has smallmouth, my favorite and most productive way to catch smallmouth is a 3" swimbait fished on a tungsten ball head jig on spinning gear fished off points in 25-40ft of water.