Customer Rating: - Large lot with the Black and Decker String Trimmer
I have a 1 1/2 acre lot. It has worked great. I would recommend getting one extra battery (2 come with it) for a lot size over 1 acre. It is great not dealing with starting a gas trimmer or a cord with an electric trimmer. It has done pretty well in the thicker areas....not as good as a gas trimmer but good enough.

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Customer Rating: - Convenience over price
Another example of gouging the consumer. The local Home Depot has these for $15.98 ,so much less than available here or even most online places.
If you prefer, wind your own for less than 1/4 the price. Takes mere minutes is all and the savings go a long way. Figure you go through 3 sets of these per year. That is over $60.00+more than the trimmer itself.
Units do work well and if price is never an option-here you go. Myself, I just buy them and snap them in as money is not much a concern other than they are entirely overpriced for what they offer and mot people hate to be swindled. B&D should be ashamed of themselves but typical of the modern greedy US corporation.

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Customer Rating: - It's okay if you're lazy!
It's great to use this item if you are just too lazy to spend 2 minutes to wrap the spool yourself. I went to Lowe's and bought the generic industrial strength spool for 1/3 the price of these, and it lasted a long time.

Yeah, I had to spool it myself, but I would rather save the money so I can buy more industrial gauge spool, instead of wasting money on these things.

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Customer Rating: - Get these extra spools and buy bulk line.
I somewhat agree with the guy from Vegas that this is a waste of money, EXCEPT that this is about the only way to get extra spools for your Black & Decker weed whacker. Note that you can buy a spool of 600 feet of .065 line from Amazon (Desert Extrusion brand, price is $8.80 for 600 feet in March 2007). Then, with the bulk line, plus these 3 spools, plus the spool that came with the weed whacker you can have up to 4 spools ready to rock and roll at minimal cost. Unlike the guy from Vegas, it takes me more than 2 minutes to hand-wind a spool, but not a lot longer, it's pretty easy to do, my main advice being I find it better to not try and wind more than 25 feet onto a spool even though it presumably can hold 30 feet of line. Everytime I wind more than 25 feet I get a lot of jams until the line gets those extra few feet chewed off. Hope this helps.