I have owned a couple Swift cases and I find them to be very durable. Dennis is a bit underrated as a casemaker. He has been at it longer than Justis and probably since Jay Flowers or thereabouts, well 25 years according to the website.
Just real good old school leather crafting. Lately I have seen Dennis branching out into different designs which I find to be very cool. I always admire a leather crafter who is willing to go outside the cookie cutter patterns and try something new.
About the only thing I dont like on them is the use of felt for the liner. I don't like felt, speaking of the type of felt that is used and not "pool table felt" (which I also don't like for case liners for a different reason), I don't like felt because it retains moisture and debris and pills a lot. Pilling is when the fabric sheds fibers and those fibers bunch up into little balls.
Anyway, from a case maker's perspective I find that Dennis Swift cases are a good value, well built, and nice looking.