I love ıt as well. It cost only slightly more than the Legup at the time I bought it.
The Legup worked well, but the Sagework doesn't need a glossy surface as the Legup does and it is far more adjustable. It packs up small as well. It can be used almost instantly from guitar to guitar.
I already had a stack of magnets virtually the same rectangular dimensions as the Sagework feet, so I had/have no need to buy more magnets.
I think it is an amazing design especially useful for smaller guitars or stabilizing larger guitars, depending on playing style.
