I don't want to fan any flames here, but the ET thread I referred might be more than usually informative since it involves authors and not just the usual message board flamethrowers. This is not to say that there isn't a lot of heat, but there is also some light:
http://www.elitetrader.com/vb/showthread.php?s=&threadid=20101&perpage=40&pagenumber=1
As far as "misunderstanding" goes, it's probably more a matter of the context or the time in which one finds oneself. I see a very distinct difference between T&S and tape reading, but someone who's never known anything but T&S might have insurmountable difficulties seeing that difference, just as those who grew up with "indicators" such as RSI, MACD, stochastics, etc., may have difficulties understanding how one could trade without them.
One of the reasons I recommend Magee's book is the distinction he makes between the map and the territory, the territory being the observable and verifiable reality (i.e., the price and volume data), and the map being our various notations of it. The closer the map is to the territory, the more likely one is to be perceiving the demand/supply reality. The farther away the map is from the territory (even a plain chart is one step removed from the territory since it "manages" the data in some way), the looser the trader's grasp of reality and the more likely he is to disconnect from it (e.g., people who trade indicators without looking at price at all).
Again, I don't want to initiate anything here. Read the thread if you like. Consider the opinions. Think about it. Decide what's best for you.