To be honest I expected them to fail or stop working after a while. I was positively surprised! It's been a few months (can't remember how many...3?) and they're still going strong. They have a good range of at least 6 feet (I haven't tested more than that), the batteries seem to work well so I don't have to toggle the keyboard or mouse on and off, and they always work automatically with no lag. I use them for office work, not gaming, so while I don't notice any lag, I don't look at it closely. They're not ergonomic in any way, but I find them comfortable and I like that they're semi-compact.
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