As with other Gigaset base units this is also very good and has better VOIP capability that the N300IP.
Excellent DECT range and these work nicely with 3CX systems giving Call Transfer with the option to just press the R (Recall) button to start the transfer. Also tested transfer on a couple of other Hosted solutions and seems to work OK.
If you are used to buying the N300IP's then bear in mind this device is a pure VoIP product and does not have the standard landline capability like the N300IP's do.
We always use the Gigaset range whenever we need a VoIP DECT handset.