I have a fair few Ryobi cordless tools, so when my cheap corded strimmer died, it was a no brainer (for me) to get a Ryobi cordless strimmer. Works fine for me.
I have about 10 Ryobi tools, and so I have four Ryobi batteries, two average and two higher power/capacity, usually with two ready to go and two ready to be charged or on charge, so I always have a battery ready to go.
The strimmer is a typical home use type, not heavy duty or designed for a pro gardener. Its not too heavy but is also not light and flimsy.
I mainly use the strimmer to edge the lawns before mowing and taking down any persistent weeds where they occur.
Our garden is not huge, the rear is about 20x10m, so 200sqm we also have a small side lawn, about 5x5m so another 25sqm and the front lawn is about 10x5, so another 50sqm, so a total of about 275sqm.
The Ryobi seems to cope well, I can easily edge all the lawns on one battery.
See linky:
Ryobi - 18V ONE+ 23cm Grass Trimmer | Outstanding Gardening from the Ryobi power tool range. Buy online today
uk.ryobitools.eu
But TBH, for years I just used the cheapest (corded) Homebase/B&Q strimmer and they worked fine, (for our old house which only had one small rear lawn of about 5x15 = 75sqm) albeit they tended to pack up and die after a few years, but they also only cost about £30? and the cords are a bit cumbersome.