Great but for internet
Place was clean, easy to find, and conveniently located near a few restaurants and a super Wal-Mart for groceries. One side faces the highway so its a bit noisy, but honestly it wasn't a problem. The staff are helpful, and I heard them refunding someone's money for an alleged problem with a door, so they even appear generous.
The only problem is the internet access. They say they have WiFi, but it's only available in a few of the rooms, and even in those it's not available all the time (i.e. it seemed to be turned off in the morning). It also costs an additional $3 per computer using the service, which put the total room cost up with other motels in the vicinity that offered free internet- Microtel is next door, AmericInn is nearby and there are a few more (look for addresses on Lacrosse in Rapid City).
If you don't need internet, I recommend this place. If you do, you may want to consider other options.