I find the sound from these instruments to be incredibly beautiful, and these instruments made by Peter Biffen to have amazing craftsmanship. They're not cheap, but I can imagine that they are a wonderful investment.
Peter some some great sound samples on his website, be sure to check them out, in order to hear the range and sound color of these instruments.
Peter makes several styles:
Has four played strings and 8 sympathetic strings. It comes with tied frets, which enable a vast range of tunings, including modern/western tunings to microtonal middle eastern tunings. Be sure to listen to all of the sound files which demonstrate the range of this instruments in both a bowed an plucked playing style.
This four stringed instrument is based on the traditional kemanche. But it looks like Peter has improved on the design and sound quality substantially.
This three string instrument is based on the traditional Cretan Lyra.
This is Peter's unique design. You gotta listen to the sound sample to appreciate what this instrument can do.
To really understand and appreciate the design enhancements which Peter has made here, you need to visit the design page on the website: