Here is some good advice from Jim Bernard in an Article from www.yardcare.com - check it out! terry
Choosing the Right String Trimmer for the Job
by Jim Barnard
Toro Electric Trimmer 51352
There are basically three options when buying a string trimmer: gas powered, corded electric or cordless electric. It is important to carefully consider your needs prior to purchase, because a string trimmer that is too heavy or an extension cord that doesn't reach can make the work more difficult that it has to be. Regardless of which string trimmer you choose, don't forget to wear protective eyewear.
• Corded Electric trimmers are convenient for smaller jobs. They are quieter, don't require charging or fueling and are virtually maintenance free. Before purchasing a corded unit, take inventory of how much space you are dealing with (anything less than a 1/4 acre is fine) and how many obstacles you have in your yard. Most manufacturers recommend using a 14-guage extension cord that is no longer then 100-feet.
• Cordless electric trimmers have all the advantages of the corded trimmers - without the cord. They are easy to use and perfect for lawns with many obstacles and trimming areas that may reach beyond where a cord can take you. Cordless trimmers need to be recharged after each use. Run times vary, so be sure to match the trimmer you buy to the amount of trimming you're doing. Keep in mind, that the average homeowner only spends about 15 minutes trimming their lawn.
• Gas powered string trimmers are great for large lawns. They don't have cords and can operate for long periods of time. But, they can be noisy, difficult to start and in general, require more maintenance than electric trimmers. Keep in mind gas powered trimmers tend to weigh more than electric models. Choose a trimmer that doesn't feel too cumbersome - remember you'll be carrying it around your yard.
• Make sure to check out the procedure for changing the line spool in your trimmer. Replacing a spool can be an easy task if you choose the right trimmer. If it looks difficult to change in the store, chances are you'll be frustrated by the task at home.
• Look for special features in your trimmer. If you have a number of edging tasks to take care of, look for a trimmer that easily converts to an edger. You'll have two tools in one. And, if you have a lot of natural borders, plants and flower beds, look for a trimmer with a vegetation guard - that way you'll be able to trim the grass without damaging your precious plants."
Hope you found this useful! terry