I read both Sniper Trading and the workbook. I found it to be quite helpful. In fact I actually took the entire system and built a spreadsheet to test and trade the system - which I did in simulation for about two months last year - trading S&P Emini's. While two months (9/02- 10/02) may not be long enough to truly evaluate any system - the system produced good results. Of course it's swing trading so there were clearly days with steep drawdowns, but some impressive winners too. As I say - 2 months was interesting but hardly a solid evaluation.
Just yesterday I dug out my old spreadsheets and plugged in a NASDAQ stock I'm trading intraday. I'll let you know how it goes if you like.
Overall, if you're new to trading (like I was when I read it) Sniper Trading presents some excellent market insight - especially applicable to the Mini's. Angell is a solid trader with some loyal and exceptionally successful fans (Linda Raschke for one).
Don't be distracted by anyone who brings up Angel's association with an SEC investigation of a prior book/system to discredit Sniper. If you're interested you can search these thread and do your own background reading - but you'll find it's really unrelated.
As in almost all books on trading there is a kernel of valuable knowledge or wisdom surrounded by a good deal of superfluous packaging. I can't endorse Sniper as a trading system, but I can say the book taught me a lot about market dynamics.