I'm curious what brought you to this breed? I know nothing about cat breeds!
Ultimately, it's personality and looks. From our breeder's website, their personality is described as "This adorable combination only hints at the mad-cap personality within – a cross, some say, between a cat, a dog, a monkey, and Dennis the Menace. They are a fun and fun-loving breed with a relaxed and social attitude rarely associated with cats. Delightfully silly in both appearance and antics, Devons are interested in everything and everyone around them. Their playful nature means Devons easily learn tricks and are always up for a game of hide-and-seek, tag, or fetch. This unique breed possesses intensely loyal, human-loving, dog-like qualities. A person must be prepared to be owned by a Devon. A Devon will eat with you, sleep with you, and perch cozily on your shoulder while you are on the computer or reading. They will follow you around the house, sit at your feet, or jump on your lap the minute you sit down."
So, I guess they remind me a bit of Dobermans, LOL! They are social and outgoing, clingy, wanting to be with you. Less aloof than many cats. And, of course, they are utterly adorable - they are supposed to be "elfin" in appearance. We'd look at some other breeds, and I also really liked Siberians, but ultimately decided I couldn't handle that level of grooming, and the personality wasn't exactly what I was looking for (although maybe down the road, who knows).
It was really fun to go to cat shows and actually meet breeds, although some breeds are far more rare than others and harder to find at shows. But the cat shows were really fun, and the owners/handlers (typically the same person) were really open and easy to talk to, and eager to tell you about their breed. Super fun!