If you get a planetary eyepiece such as a 6mm Goldline, you will get an extraordinary amount of detail from Solar System objects. The details on Jupiter will be much clearer, the space between the Rings of Saturn will appear, and surface detail on Mars will be easier to see.
You will see an insane amount of craters and mountain ranges on the Moon, and phases of Venus will be observable.
Uranus and Neptune will appear as blueish dots. On ideal conditions, you may get a glimpse of Neptune’s largest moon, Triton.
Overall the planetary performance of SpaceProbe 130ST, out of the box, is not good. An expensive, high-quality, low-aperture eyepiece is necessary to get the most out of the SpaceProbe 130ST. Otherwise, you will be stuck with mediocre performance in this area.