Bought a Makita XRU18 weed whacker this week. 18x2 says all over the box that it's equivalent to a 30CC gas trimmer.
You can see my thread where my Husqvarna gas trimmer died, and I bought a brand new "professional" 525L trimmer, which died in about an hour of use. I really like my Husqvarnas but I decided to return the 525L for a refund and try the battery power.
I put it together, which took about 5 minutes. I put a couple 5.0 batteries in it, and went to work. It probably ran for 20-30 minutes on a charge, which was enough to do about 2/3 of my yard, which had been neglected for a couple weeks while I was dealing with dead trimmers. I wouldn't say the Makita is much lighter than my gas trimmers, with batteries on it, but it sure is quieter. As for the power - well it certainly is deceiving, because it's so much quieter that you don't think it has much power. But it does. I had to get used to letting the trimmer stop as I was walking between sections.
So how does it work? Pretty well. It has three speeds and even a reverse, but I just set it at the high speed and used the variable speed trigger to control it. At the top end, I wouldn't say it has more than my gas trimmers did, or maybe even quite as much, but it's close enough that it will do fine. I did find it had more power at lower speed than gas - which is nice - because I'm working around windows a lot, and I don't want stuff flying and breaking glass.
I did not like the small string head that it came with. I could only put about 15 feet of line on it and the bump feed is pretty wimpy. I'll replace it with a Husqvarna high capacity head when it wears out. I also don't really like the size of the handle at the trigger. It seems like it's too big for my hands, and the trigger is a bit uncomfortable to use. I like the triggers on my Husqvarnas better.
What I really like is not having to mess with starting it, or idling it or the noise or fueling. I went through 1 set of batteries and probably 2/3 of a second set in an hour of elapsed time. The trimmer wasn't running the entire hour but most of it. I think it's a keeper. Let's hope it keeps working as well as it did the first time.