This text is very reader friendly. I have used this book in college and enjoyed it because of the fact that it is very clear and provides many illustrative examples to clarify certain concepts. I do agree with one reviewer in that its too bad it does not have solutions to the end of chapter problems, and for that I give it 4 stars instead of 5.
If you want to get a clear concept and understanding of DSP without the complicated and exhaustive mathematics from other books, then purchase this one and keep it in your personal library.