I have bought Signature Touch. The devices are all about craftsmanship, materials and quality. High-quality leather, liquid-metal alloy, crystal sapphire display, ruby keys, immaculate attention to detail on the inside and out. Each phone is crafted by a single person who signs the phone, trained in the old-world way of complication watch making.
Hasselblad-tuned camera, London Symphony Orchestra-sourced tones, Dolby audio. The audio quality and speakerphone are incredible.
Vertu could do more in the software arena. They do have a light skin on Android - and several Vertu apps for various lifestyle services and experiences.
99% of people will never care about the craftsman aspects - but if you value attention to detail and a story behind the products you own - the Vertu is for you. For everyone else, there's no way you could ever begin to justify it.