This is a great accessory. Some guitarists prefer to have both legs at the same level rather than having to raise one knee. Having one knee raised every day for years can lead to knee problems or exacerbate them.
They also are a great help to people who may have a pre-existing knee condition from an injury or those suffering from arthritis. This product has great reviews on Amazon. I am providing a link to the product on Ebay and Amazon. With Amazon you can get it the next day but you have to pay a few pounds more. On Ebay it comes directly to you from China. It is a few pounds cheaper but you may have to wait about 2 weeks to receive your item.
The price listed is the Amazon Uk price. Please choose from the following links. As I said above the ebay price is less but comes direct from China. (I am an Ebay partner and Amazon associate and get a commission if you link to them through me and buy)
Please note that this product is designed for a right handed guitarist as it has a taper to lean the guitar into the body of the guitarist. Please watch the review video below the links. The video is American based and the product does not have the same name.