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Only $499.... 2 flexvolt batteries, and charger..
Already own a cheapee miter saw, but not a sliding one.. this one slides... and I assume is more accurate than my harbor frit saw..
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I'd say don't waste your money on the cordless version, miter saws are way to much for batteries of any voltage. The only usage you can really get out of these is working with trim out materials such as crown moulding, baseboard, quater round, shoe moulding, etc. Even at that you'll be changing the batteries ever hr. or so. Very frustrating to work with on a full job IMHO. I have a buddy who has one of these & he brought it to a trim job we were doing, I was so sick of it after one day I brought my proper corded miter saw in the following day. The batteries constantly needed replaced & we blowing cuts left & right cause the batteries would die in the middle of cuts (Li-on batteries tend to just stop flat out when they need charged vs Ni-cads that would slow down some which alerted you to the fact they were in need of charging). The only thing I would find this saw useful for is repair work where you'll only be making a few cuts on the job.
I would suggest this saw TBH, https://www.homedepot.com/p/DEWALT-15-Amp-Corded-12-in-Double-Bevel-Sliding-Compound-Miter-Saw-DWS779/206541015, it's corded so no worries about power, takes a 12' blade so the cutting height is good, slides for cutting wider materials, is double bevel to make life much easier for making miter cuts, & is $100 cheaper. Then if you really want to go all out you can get the same saw I have, https://www.homedepot.com/p/DEWALT-15-Amp-12-in-Double-Bevel-Sliding-Compound-Miter-Saw-DWS780/202922350. Although the extra features you get for the $200 more it costs are more useful for working with large framing lumber than anything else making it a great job site saw but kinda overkill for a home project saw.