Basic Bounce is exactly what you'd expect. It's a relatively straightforward course emphasizing springs and all that come with them.
Overall, the map is pretty fun in netgames, and the layout is serviceable, but it is... well, basic. I would love to see some more scenery out in the sky-abyss surrounding this track, or a big central setpiece of some sort. It would make the track more fun to look at for sure.
I would recommend trying this one out with some friends if you haven't already, the core of the track is real solid and you might just find a new favorite map.
The Secret Slide is much easier to review: It's the secret slide from Super Mario 64, almost entirely unaltered. You get what you paid for, with some guard rails thrown in for free. It's absolutely a fun time.