Cordless string trimmers

I was hoping that someone could help me find the June 2011 article rating cordless string trimmers or summarize its recommendations.  I subscribe to the magazine but I can't find that issue or the article by searching this website (probably my problem).  I am in the market to purchase a new cordless trimmer and don't want to buy another dud.  I have had two Black and Deckers, the first worked reasonably well but the second one did not.  It takes a very long time to charge and doesn't provide more than 10 to 15 minutes of running time.  This has been its performance since the beginning.  Thanks for any help that you can give me. 

UPDATE:  I found my June 2011 issue with the article. Thanks.

Great! There is a two month delay in getting content on to the web site from the magazine and not every article from the magazine goes online for various reasons.