What is your experience with lower-end tile saws purchased at Harbor Freight?

I did the same thing. I bought a saw from Lowe's for about $50. It was cheaper than renting. The only problem was the blade quality. At first, it cut great, but dulled quickly. It was enough for me to tile a large outdoor kitchen counter with slate. To give you an idea, a replacment DeWalt blade will run about $25. Store brand blades can be found for $10-15. You will save money over renting, but figure in the cost of buying additional blades for your projects.