I only wear Mendl's, they are the longest lasting boots I have had at a year per pair. I wear them every day, they get covered in blood and hardly ever dry out but I have never found a pair that leaked within that year.
I have killed the LeChameau, Matterhorn and vairous others within 6 months.
Rather buy an expensive pair once a year than several cheap ones in the same time. You have to walk on your feet all your life, so look after them.