I use the phone Gigaset DX800A now for over a year and am at peace except for a few minor flaws very. In connection with the cordless device SL930 there were initially major problems, Show simple functions such as phone book, the phone number show when you receive a call did not work properly or not at all. Meanwhile, the compatibility of the devices has been improved considerably with each other via various firmware updates. Especially devices of Gigaset should work with each other fully and without restrictions. I use the device in a legacy ISDN connection of the Telekom on the S0 bus of the AVM Fritz box 7490. Here there are no problems. Even an analog fax machine, switched on the DX800A is working properly. Operation and menu navigation are nearly perfect and easy. Sound of the equipment is in order, however, would have liked to see an HD sound for the price. Devices of AVM have quite a few years. About Optics can indeed argue known, single mango here would be the piano lacquer surface of the device, matte black would have been much better for me. About further details of the settings I want to do without in my reviews. Conclusion: Gigaset has brought with its DX800A a truly decent phone for small offices on the market, which, however, still a lot of hidden potential. Good value for just about ok. For my part, I would say, buy recommendation. Settlement of purchase on Amazon, perfect