The way the deal works is this, if you buy the full Maschine, you get two expansion kits, if you buy the Mikro version, you get one. Native Instruments offers three different expansion kits for Maschine, Tru School, Vintage Heat and Transistor Punch. The packs sell for $60 regularly so this is not to bad of a deal.
Here’s a video of a guy using Maschine to make some hip-hop. If anyone is interested, it also shows how to make a beat form beginning to end from a record, check it out.