Smooth dolly shots usually cost a fortune. In 2019 I found a motorised mini dolly from Neewer for around 50–60 euros, with three speeds and a remote, and I honestly don't know how I managed without it.
Unboxing
The packaging is nicely done: a hard box with a plastic finish. Inside you get manuals (English and German), a remote control, a USB-C charger, a sheet explaining the speeds and how to set the wheels, an extra rubber for the wheels, and mounts with 1/4" and 3/8" screws so you can attach almost anything.
It comes with the battery already inside. Remove the plastic tab to make it work, and remember to take the battery out after each use, because it drains very fast otherwise.
The first surprise: it's heavy. More than I expected. It feels like steel, or at least a very strong plastic, which makes sense because it has to carry a camera and a head. The legs fold with set angles, the wheels are rubber, and there are buttons for the three speeds, on/off and direction.
Why I needed it
Have you checked how much a professional camera dolly costs? A lot. I searched and found very cheap manual dollies that don't really work, and electric ones from well-known brands that are really good but way too expensive for a not-so-famous YouTuber like me. This one hit the sweet spot.
In use
Note that the head isn't included, so I took the head off my Joby GorillaPod. The movement is really fluid, with no need for stabilisation in post. The three speeds make it suitable for every use, and the remote is the best part. Most cheap dollies I'd seen didn't have one, and it's so handy when you're trying to keep your subject in focus. Folded, it's very portable (heavy, but compact).
If you want cinematic footage and want to step up from regular video making, this is something you definitely need. A cheap dolly that works great.