This is a reasonable introduction that covers all the important things. The focus is (as it should be) on money management, and very simple (but effective) technical analysis. Support & Resistance, trendlines, and moving averages are the primary mechanisms used. I thought it was a little confused, at parts, and found myself comparing it to John Murphy's Visual Investor. They both seem to have a similar target audience (people new to technical analysis). On the one hand, The Magee book covers money management which Murphy seems to do a poor job covering in his books (Technical Analysis of the Financial Markets has a bit on it, but nothing extensive — none of his other books mention it at all), but the Visual Investor gets the nod for just being a better written effort.
If this is your first book on TA, you should be fine, although I think Visual Investor covers the topic better. If you are already familiar with the basics, I would pass this one over for a more advanced book.