Assuming that everything works and you're happy (easy enough to run the self tests as others have mentioned, and also measuring the probe calibration signal on every channel at each hardware input attenuation - change V/div until you hear a relay click), then you'll likely want to look at a few other things:
- If you have the attitude of "i bought the hardware, i can do what i want with it" then use the "Riglol" online tool to generate the unlock code for 100MHz + all other options (use DSER code, DSFR causes issues). Depending on who you bought it off it may already be done!
- The stock fan is a bit noisy, and there are lower noise fan options to change to if you're not living in a scorching hot place where it really needs the airflow. I used the same brand as the original (Sunon i think) but a model in a different lower noise range.
- The encoder for the selection/intensity knob is a bit of a pain (without detents i find it too sensitive to being moved when you're trying to click it), but if you're up for a bit of soldering iron surgery it can be replaced with a detented part. There is a thread somewhere here on which part to buy and how to do the mod.
With or without the above mods, it's great value, especially for a first scope. I only sold mine as I upgraded to a significantly higher end instrument. Have fun!