I bought the Worx G2 a couple of years ago and absolutely love it. Liked it so much I bought my parents on last year for Christmas. I have had some troubles with the charger and the battery.
I've used several other weed-wackers in my life, but not have even come close to the WORX GT. I got it for Father's Day last year and have been amazed at what it can do. The best part about it is that the threading doesn't need to be re-threaded ever 3 minutes like others I have used. Once you load the thread, you don't need to mess with it again until you change to a new one. Amazing!
It's a great feature to be able to get free spools. However, last time I ordered the spools I received a spool cap. It would have been nice to receive one this time.