Important details: we use an older (2018) Intel Macs on AtlanticBB/Breezeline. We've used an ATT landline for years & have never had a cell phone or Internet phone; we're probably the last GenXers in the US to even have a landline, & since we barely use the phone anyway, never felt the need to switch. However, ATT's worsening service, horrible customer care, and persistent issues with our line finally drove us to look for other options. Ooma was recommended to us by folks on the Reddit sub for our city (r/Columbus). I was a bit concerned over the bad reviews here, I admit, especially since health issues require us to have a reliable 911 ability. After going thru the entire setup process, I'm now puzzled; the biggest problem we had was entering our credit card info. So, this is the basic Telo unit with three wireless/wifi handsets. Telo plugs into your modem/router, handsets' bases need to be plugged into a power source & the bases connect over wifi to the Telo unit. We've currently got two of the handsets in use; third is being saved as a backup. The setup directions (booklet & app) were clear and easy to follow: set up the account, plugged the Telo unit into the ethernet port of our modem/router unit & waited for all the updates to finish. That part took over an hour, mostly because our ISP had sent us new equipment the day before and THAT was having fits. Two reboots, one reset & a call to Breezeline support later, our Internet finally stabilized & Ooma's Telo finished its updates. Plugged in the wifi handsets, waited for the handsets to download their updates, got the "welcome" call from Ooma, and much cheering commenced. Our ATT line has been filled with static for the last couple months, ruining several important calls & making it hard for callers to hear us, too. As our first test, we had my elderly mother-in-law call us on the new temp number, and we talked to her on a perfectly clear connection on those wireless handsets while we walked around the apartment to make sure the connection held. It's a small apartment, roughly 600 sq ft, and the connection was clear & strong all thru it. We're surrounded by tons of other Wifi points/home networks, but there's no interference. We're still getting used to all the options & menus on the handsets (old phone is just a simple handset attached to an answering machine), but the documentation & shortcut card have been easy to understand & follow so far, and our phone needs are pretty basic anyway. the only major issue was getting the billing information entered in. For some reason, Ooma's app, website, & automated phone customer-service refused to accept any credit card info from us. Bank showed no issue with the account, but didn't show any declines or auth attempts from Ooma, either. Took two calls to Ooma Customer Service to resolve -- first rep referred us to the automated phone line (no go); second call rep had to transfer us to an actual supervisor to manually enter the billing into our account. Our old phone number finished its porting yesterday -- took only a week & works great. I'm dreading the ATT cancellation call, but that's ATT's issue. I'll add to this review after a month or so, after we've settled into and used Ooma a while. But so far? Impressed.