My ukelele and mandolin straps are individually hand-made in the UK from glorious top grade leather that looks and feels amazing. A well designed strap can make your playing experience so much better. Use the strap to set the height at which you play. A consistent playing height can help to set the 'muscle memories' you need to become a better player. Also, you won't have to find somewhere to put your instrument down if you fancy a drink!
Just so you know: my straps get even better when they are 'worn in'!
Some straps can be personalised with up to three tooled letters (think 'initials') but check individual listings for information.