The 20mm eyepiece is a marketing scam. The corrector lens inside it lowers the contrast and the crispiness of the image greatly.
Image quality is vastly more important than seeing the image in the correct rotation. Especially if the image you are trying to see is in space, and most of the time spherical, like a planet or a galaxy.
The 10mm eyepiece is a decent Kellner. But it provides too much power for a good image anyway. So it is almost useless like the 20mm eyepiece.
The red dot finder works properly and doesn’t bring up any complaints.
The focuser is the best part of this telescope, which is almost funny. It provides smooth motion with sturdiness.