Personally, I think a better entry scope is a used Tektronix on eBay (like a 2445A).
You can get one for 1/3rd the price, with 3x the bandwidth, and 2x the number of channels (4ch vs. 2ch) vs. the Rigol.
Of course, it doesn't have a fancy LCD display, and cursors and things like that. But it will also teach you the basics of how to read the scope without relying on automatic readouts.