I have had the same MX Ergo for a few years now; no issues. I went through several M570s before making the switch. In addition to durability I had constant sign

I have had the same MX Ergo for a few years now; no issues. I went through several M570s before making the switch. In addition to durability I had constant signal issues with my M570s–lag, dropouts, etc–that I do not experience with my Ergo.