Greenworks PRO 16" 80V Cordless String Trimmer

8/25/18 Update - Another headache with these things is how awkward the string replacement is. It uses the "bump" system to release more string. That works terribly. Have to hit it several times. Replacing string is the WORST though. I have many Greenworks products, mostly 80V and one 40v device. They are all pretty good, some very good. This string trimmer is just awful. AVOID. 4/29/17 Update - I have a number of attachments that go with this unit and they all mount the same way. There is a collar with a bolt you turn by its green thumb handle. A close up of the unit will show you what I'm talking about. The threads on the bolt seem to have stripped right at the place where it tightens down and so nothing stays in place now. The warranty is "limited" and 4 years so I'm hoping they cover it. I'm always careful not to overtighten these things and it's clear the bolt is made from a softer, cheaper metal. The design looks unrepairable so it's doubtful whether I can upgrade the bolt somehow. === While the line lasted, it did a decent but not amazing job of cleaning up the weeds along the edge of the property. My biggest disappointment with this product is the absolutely abysmal support for new owners wondering how to install new line, what line is compatible, etc. There are zero videos showing how to do it, as far as I can tell, no online manuals (pdf). I am now looking at some line I ordered from Amazon which I will need to return because it's not correct. The line sellers were equally unconcerned about which trimmers might be able to use it. I purchased the mower, branch saw, blower, several other Greenworks products because I wanted this to be an effortless experience. I like the mower. The 80v battery keeps a charge (only a month old). But this is not effortless. Just the opposite. Maybe I should have gone with EGO, which has a much better mower design as far as I can tell. The trimmer is without line so the weeds have won the day. I'll get this figured out eventually but my happiness with Greenworks is very short lived. I did see someone from support offer an email address to another customer requesting support. I will have to try that. An email address. Are they kidding? -- By the way, I tried the email address provided by Greenworks to another customer. It came back with an error - no such email address. Another issue - replacement parts? No information readily available.