Good, but needs work out of the box!
Power: It's got plenty! I'm cutting a 1-acre yard and a 9 acre business lot with a lot of pasture land, and this thing will chew through everything I throw at it with no problem, so that's a plus! It has two speeds, but I've not yet found anything I needed hi-speed for. The low-speed is 5000 RPM and the high is 6000 RPM. Low will do probably 99% what you need from it.
Comfort: I personally find it very well balanced, but if you need to adjust the forward grip for your height or arms, you certainly can. It's not hard to do at all. It's quiet compared to my gas trimmers so I love that! No more fuel-oil mixes to worry with! No more carbs being replaced in my Stihl. I'm done with that!
Battery: I might edit this later, but so far I've found the battery to be fine. In case you're confused, this is a flexvolt 60V battery, so if you're using it in your Dewalt weed trimmer, it's running at 60V so it's a 3AH battery. If you're running it in your 20V tools (like handheld drills, fans, saws, etc) then it's a 9AH battery, which means it would run deck screws all day long on one charge. It should holdup fine for most anyone I'd imagine.
Charger: It comes with the generic 20v charger every Dewalt tool comes with. If you need to fully-charge it, it's going to take a couple hours... somewhere between 3-5. If you really need the fast-charging, you can get the fast charger and folks say it can full-charge in about an hour. I just bought another battery, so I'm fine with the normal charger. Yes, you can use any of the other 20v lithium chargers from any of your other Dewalt tools to charge it - just in case you're curious.
So this was the first negative thing I noticed. This trimmer is going to throw mess ALL OVER YOU the moment you fire it up. You're going to be covered in debris from head to foot! This guard sucks. The funny thing is, Dewalt sells a much wider guard for about $6.20 on their website. The part number is: N512929 and you can find it here:
(Shipping will run you $12, but it's still worth it).
This trimmer comes with 25' of the 0.08" Dewalt string on it. I burned through that like a hot knife through butter. I replaced it with the standard 0.095" thicker string I usually use and it's worked like my gas one does - much better. So my advice, if you have a lot of concrete to edge or fence posts, run a larger string on it. If you're not edging, then you won't care but if you're not edging something then you likely wouldn't need a weed wacker anyway, right?
So I tried to give this thing the benefit of the doubt and just assumed I was an idiot, until I started reading other reviews. So listen to everyone else on here and believe me when I tell you this trimmer head is total bunk! You can get a replacement Husqvarna T35 for about $13 on Amazon, which is what I did. If you need to figure out how to attach it, simply read the manual. You just pop a small screwdriver in the slot on the side, turn it until it slides in all the way, then turn the head CLOCKWISE to take it off (it's reverse threaded), and screw the new one on.
The issue with the head is that Dewalt really dropped the ball on the assembly of the string head. It's a pain to feed new string through the holes in the head and still be sure you don't get it coming off the spool. When it does come off the spool, it ties up around the spindle and then won't feed when you bump it. When it happened to me once, I figured I was the idiot. When it happened twice in 4 hours, and then again 5 minutes later, I ordered the new head. I'm not dealing with that mess all summer and neither should you.
All said and done, I still think the unit is amazing. It's got two problems and both of them are around $10 to replace with better parts. I wish they would make the larger guard standard and fix the head, but I'd still buy it again if I had to do it again. Totally worth the slight effort it takes to take it from "pretty good " to "great".