I bought this to replace my 15 year old B&D trimmer which finally gave up. It uses the same string cartridge and the last B&D was very reliable, so I stayed with the same brand. This one is lighter and the string feeder, both automatic and push-button when needed, are working great. I have a quarter acre lot with a long driveway, multiple beds, and a sidewalk which all need trimming. Running at the higher speed has not yet depleted the battery, so considering it comes with a spare, I can't envision running out of battery life. I particularly like the wheel which allows you to rest the trimmer on the ground when edging upside down, and it really helps because you are not suspending the weight of the trimmer to do edging. It also works well to space the trimmer from walls or fences when trimming around them. The only assembly is attaching the guard. A note on that: the guard has 2 little wings that slip into a slot, and then one screw. I had a hard time aligning it and nearly broke the tabs, so I recommend looking closely at it and once you have it lined up right, it clicks right in. I was aligning it incorrectly, which is my fault, but I can see someone breaking it as I almost did. So far, works great and nice to use the B&D trimmer cartridges I already had and not spend extra money on those. Would definitely recommend, esp at this price point!