More power than you might anticipate; it exceeded my expectations.
I got this for the price and because I don't want orange extension cords to be a part of my life any longer. At 20V I imagined that I'd just sort of putter around in our small postage stamp size yard, but this thing has some serious get up and go.
It takes down tall grass pretty easy, edges nicely (though holding it inverted or sideways to do it is a little awkward) and I have no problem with the spool / feed mechanism. I like how it collapses down to store and the battery charges to full relatively quickly (takes about 45 minutes to an hour to recover from our average use).
Quiet for the most part, and the shield does a nice job of not getting in the way of using it while saving your shins from the stuff that gets kicked up.
All in all, this has almost the same power as those echo 2-cycle trimmers while on a full charge, and enough power to take care of everything else all the way down to being almost empty. Do your edging and heavy trimming first, and you should be fine.
I cut our small lawns plus a couple of neighbors, so imagine a total 30x30 area with lots of edging, bird feeders, trees, sidewalk, stairs, etc to trim around.
Honestly, this exceeded my expectations and I recommended it to a neighbor and let them try it out.
Verified purchase: YesCondition: Pre-owned