My entire reason for selecting this phone was the "Link2Cell" feature so that I could use my cell as a cordless phone with a more comfortable handset as I frequently have extended conversations with my mom and others. For reference, I have a Moto G3 phone linked to the unit and I use Consumer Cellular wireless phone service, having now dropped Verizon HomeConnect to save money.
So far the call quality has been very good, but not perfect all the time. In conversations with Mom, who talks to me directly via her cell phone (also Moto G3 Consumer Cellular), a couple of times her voice became garbled. This mainly happened when she used her speaker phone. To be fair, part of it could simply be the service and connection with Consumer Cellular although they have full coverage in both locations.
PROS/THINGS I REALLY LIKE:
Text Message Notifications - a low volume, unobtrusive chime sounds and the name of the party messaging displays on the headset. I then check my PC with SMS interface and can read and respond to the message.
Automatic Bluetooth pairing setting - All I have to remember to do when I come home is turn on my cell phone's Bluetooth, and within a minute the Panasonic picks up and links to my cell.
Volume and speakerphone on the headsets is very good. My mom has said she can hear me just as well with the linked handset as directly on my cell phone.
Programmable features are great. Ring settings can be set independently so if 2 different phones are linked, you can tell which number is receiving a call.
Basic limits - it may be that the wireless carriers pressure manufacturers like Panasonic not to make this technology too perfect so people will still need a regular type phone and pay for a second phone line. As mentioned above, at times the conversation became garbled and the phone once was slow to react to a call coming in (already my cell phone was vibrating for 2-3 rings).
Short battery life on handsets - I was surprised to see that the handsets each used 2 AAA rechargeable batteries (supplied with phone). While they charge up quickly, when the phone is off the charger the batteries run down fairly quickly even when not on a call. I like to rotate the handsets so they don't just sit on the charger constantly after reaching full charge. Since I can use both handsets if necessary it's a non-issue for me, and for normal length calls it won't be a problem.
Programming takes awhile to figure out - it took me about a week to get everything set the way I wanted. The manual is very good but there's ALOT of information in it so it takes time and patience to get everything set the way you want to. There are codes that can be entered to the phone to take you directly to the setting you wish to change. These are useful but you have to refer back to the guide every time for the ones you use irregularly.
OVERALL - Very pleased with this; the money saved from dropping back to one phone will pay for the phone in less than 4 months. Just don't expect absolute perfection from this as it has its limitations.