This trimmer has proved very serviceable for my 1/3 acre suburban lawn. It's not as high powered as the gas driven other brands out there, but for general trimming around the foundation, flower beds, fence posts, etc. it's a great machine.
I like the flexibliity of the unit: the handle articulates, the aluminum shaft telescopes to adjust for user height, and the cutter head angle adjusts to insure comfortable hortizontal trimming. Definitely, a well-designed unit from an ergonometric perspective. In the trimmer mode, the cutter guide/guard provides close, precise trimming without accidentally damaging plants or flowers, something hard to achieve with my old corded Toro. A few quick snaps and adjustments and the unit converts into a sidewalk or driveway edger. A caveat here: the unit trims nicely as an edger, but it's not definitely not powered to trench cut with the trimmer cord. When I tried to get the machine to cut into the dirt next to the sidewalk, it balked and the trimmer string would not advance properly. If used just to edge the grass with a clean vertical cut, the unit performed nicely.
Power-wise, the GT's lithium ion battery provides sufficient power to handle my 1/3 acre routine trimming on one full charge. The user manual indicated a 30 minute recharge cycle for a full recharge, but my recharges have been about 40-45 minutes--still a very quick recharge time compared to other battery-powered models. I pushed the unit by tackling some overgrown grass and weeds in the adjacent vacant lot and it cut them nicely, but they obviously strained the unit to the limits of its power capacity. It can handle that type of work, but if you have lots of it, you're better off with another machine with more power.
If you're in the market for a lightweight, easy to use, comfortable trimmer/edger with good power for general trimming and edging on a typically sized suburban lawn, the WE151.5 is a good choice. The old corded Toro trimmer I replaced with the Worx GT was nowhere near as versatile, convenient, or comfortable to use. Good job, Worx!