I tested the Merach S29 and the big headline is simple: it’s a home exercise bike that doesn’t need to be plugged in, and it can adjust resistance automatically during workouts. Because it’s self-powered, the screen wakes up as soon as you start pedaling—no charging, no hunting for an outlet, and no cord clutter. That makes placement way easier in a real home setup, whether that’s a corner of the living room, next to a window, or even a small office space. It’s also easy to move thanks to the front transport wheels. On the ride feel, the magnetic resistance and 40 lb flywheel give it a smooth, steady, predictable motion that doesn’t feel jumpy when you change effort. It stays quiet (around 25 dB), so it’s realistic to ride while someone’s watching TV or working nearby. I also like the comfort and adjustability: the saddle has more padding than a typical hard road-style seat, and you can adjust seat position and handlebar height to dial in your fit. The resistance buttons under the monitor let you step through 60 levels electronically, and the auto-resistance syncs with workouts in the app (and supports platforms like Zwift and Kinomap), so it feels more like guided training than just spinning pedals—especially for the ~$400 range.