I've had one of these for nearly 15 years now and love it so much I bought one for my sister in law. I just bought a third machine because a relative visited and loved it so much I gave mine to him. This portable Yogasleep Zohne manufactured by Marpac is small and perfect for travel but most importantly has the really excellent, deep base sound that is essential for blocking out noise. Most Noise Machines, including the large ones, are lacking the deep base range. The high-pitched-tinny treble noise does NOT block out the deeper noises like dogs barking and car doors slamming. The deep base (like the deep rich Bose stereo speaker sound) is what blocks out those noises. Unfortunately I'm sad to see there is one consistent defect with this particular portable machine that is annoying. All 3 units I purchased have faulty wiring connection in the plug/wire connection area where it attaches to the back of the machine. When you turn it on, any touching or jiggling of that plug/wire on the back causes the sound to cut in and out. It seems like eventually, these loose wires will break apart and it won't work. Which would be a pretty expensive loss at $78.24. I also own several of the large round Yogasleep Dohm units also manufactured by Marpac and these are bulletproof and work forever, have deep rich basey sound, and are PERFECT. I'm on the fence with this one though as I think it should work perfect from the start. But I do love it.
Rating: [4 of 5 Stars!]