Other reviewers have already addressed the lack of backlighting on the Panasonic KX-TS3282 phone's LCD screen (I have to use a gooseneck lamp to compensate with the phone propped up at a 45 degree angle) and the omission of a switch (instead of being forced to plug and unplug the fragile 2.5mm connection) between the handset and the optional headset. Instead, I need to discuss Panasonic's design failure to include all calling and receiving methods in the battery backup wiring, and the failure of their user manual to explain.
The user manual on page 9 only makes it clear that during an AC power outage you can still use the handset to make or receive calls (but not use the intercom). However deeply buried on the 3rd page of troubleshooting guidelines (page 66) is the remark that during a power failure, you can't use the headset. I make and receive virtually 100% of my calls using a headset to keep my hands free for keyboard notetaking and internet lookups, and 100% of all the power outages I've had were total surprises. So I did some testing, on two separate KX-TS3282 phones.
My testing revealed that the battery backup system is not wired to prevent a call from being dropped during these cases: 1. ALL headset calls!!! 2. Speakerphone calls where the handset is left on the cradle (however, when the handset is laid on your desk, an AC power outage will result in transferring a speakerphone call instantly to the handset).
To solve the headset call drop problem, I experimented to see if some brand of headset could be plugged into the handset jack, and that was successful. The headset that comes with a Plantronics T10 or T20 phone uses the RJ style plug just like the handset cord's plug, and there are a few other non-Panasonic headsets that also use the same RJ style plug. I also found that to record such calls, I could connect the Radio Shack 43-1237 recording adapter to the Panasonic's handset jack, and then connect the Plantronics headset to the built-in RJ jack in that recording adapter. It seems a pity that there's no easy way (without hand wiring together a special connector -- and yes, I did email the horribly-Amazon-reviewed HeadsetBuddy people in Austin TX about their connector for this, but received no reply after 4 days) to connect any of the recommended Panasonic headsets into the only wiring handset connection on that Panasonic phone for which the backup battery system works.
I also found that the included Panasonic AC power adapter's prongs were fitting too loosely into the AC power receptacle I had. That caused sudden AC power outages unless the adapter was tightly taped to that receptacle. Upon the recommendation of a longtime electrical engineer, I used two tiny needle-nosed visegrips to put slight opposite direction twists partway up each prong so they would fit more tightly in the AC receptacle. That worked superbly to give a more secure connection.
So Panasonic gets thumbs-up from me for excellent call quality, but thumbs down for no back-lighting on the LCD screen, no switch between the headset and the handset features, grossly inadequate backup circuit design which could have easily included the headset (which cuts out being able to use all five of the page 61 manual recommended Panasonic-branded headsets reliably), sloppy user manual tech writing for failure to warn buyers clearly and up front that all headset calls (and speakerphone calls where the handset is left in the cradle) would be dropped when AC power dies, plus the sloppy fit of the Panasonic AC power adapter prongs to maintain a reliable AC connection.