I bought this handset with an additional handset, I am really pleased with the purchase. Quality is good for VoIP however it will always only be as good as any normal Skype call, meaning there could be slight delays. All this is due to many factors of your internet connection, remote Skype user connection speed and distance of calls. I often make calls to South America and Scandinavia without any problems.
I am really happy to have bought these as it saves me a lot of money.