Twin neck guitars, or double neck guitars, which is another way to call them, have acquired quite a popularity in US, mostly thanks to the guitarist Jimmy Page from Led Zeppelin. They are a subset of a more wide group called multi neck guitars. Of course, it is very rare to see guitars that have more than a double set of necks, although the models with three and even five necks do exist – they are to be considered mutants of guitar instruments, though.
These double neck guitars sure look nice and impressive, especially if you are a serious rock music fan. It is a very tempting image to have yourself rocking some hard rock on a twin neck in front of awe-struck crowd, but maybe you should think about the functional qualities of these instruments, too, and you might discover that those guitars are not very suitable to you.
See, the twin neck guitars are very heavy. They weigh at least 4 pounds more than normal electric guitars, and that means approximately 12 pounds. Can you carry this much on your roads is the question (of course double neck acoustic guitars are less unwieldy). You’d be better off carrying a bass guitar, a Taylor 814ce and a Gibson Les Paul, then rely on your double neck to act as a substitute for all.
Most professional guitarists would definitely agree, and even those who actually own these guitars admit that twin neck guitars are not very good for the role of lead instruments. If you do have a song that just cannot be played without an instrument that allows to quickly switch between two styles of instruments, for example a 12-string and a 6-string, then a double neck guitar is for you, but in other cases just buy a normal guitar and gather a band that performs the other roles for you.