The first fan I purchased was the more expensive 715S, but its vertical oscillation angle was only 85 degrees, which felt too limited for me — I was hoping for a wider angle. Additionally, the temperature control had issues, so I decided to return it for a refund.
The second time, I chose the 513S, which has a slightly wider vertical angle — I believe around 105 degrees. Unfortunately, I bought a used unit, and it arrived missing the base screws and the remote control, making it unusable. So once again, I had to return it.
That said, I really like their app, so I still plan to purchase from this brand again. Hopefully next time I’ll receive a unit that meets all my expectations.