Both versions of the kit use all discrete components. The difference is that the kit GP linked has surface-mount components, while the one you linked has throu

Both versions of the kit use all discrete components. The difference is that the kit GP linked has surface-mount components, while the one you linked has through-hole components. I built the through-hole version a few years ago, and it was great fun to try some classic 555 circuits. If anyone is unsure of their soldering skills, the through-hole kit would likely be the easier one to start with. Evil Mad Scientist makes some awesome stuff.