That's a good deal. It's a pretty old product but a lot of people prefer the tuning of this generation to the last two and if memory serves it actually also apt-x.

If anything, it might sound too good to be true. At least based on a cursory research of eBay for used models which are flirting with 100 bucks. Sometimes more.

I can't speak to the battery replacement situation but just generally speaking, $45 for a refurb XM3 would be good value.

$45.. . My fear is it might be in worse condition because the price is so low. Seems like a reasonable bargain if there's a legitimate return and it's not "as is."

If it is as is, be aware you're taking a risk of some sorts. But the benefit would be great if it paid off.