I don't own one. And if your only worry is about leaving it unattended in the hotel, you don't need one. If I'm leaving my hotel room and know housekeeping may come in, I put my laptop back in my backpack (which DOES NOT look a thing like a laptop bag, yet has a compartment for one, padding and everything. That is key. Some bags scream "I have a laptop in here, steal me!" Not mine. It's a regular backpack that I use every day at college and just happens to have a padded sleeve for laptops). And then I simply lock the zippers with a cheap luggage padlock that could probably be picked in 30 seconds by a trained chimpanzee.
Not secure either, but nonetheless, it is a deterrent and housekeeping or anyone else walking past the room doesn't even know I have a laptop (since all accessories are in said bag). I've seen housekeeping at various hotels who leave the door wide open while they go down the hall to grab supplies. Anyone could walk past, see your laptop on the table and take it since those locks can be broken in seconds. But if my laptop is hidden in my backpack, no one even knows I have it.
Laptop locks only stop the casual thief. Not knowing there's anything valuable to steal will stop a professional thief 😉