I have been installing seamless gutters in the hillcountry and surrounding areas for 15 years. Custom miters more than double the longevity of your install. Anyone can install seamless gutters with miter strips. Custom miters take a very experienced fabricator to prep and install. Protect you home, it is an investment. Foundation issues caused by no gutters can cost thousands of dollars, some can be in excess of 10,000 dollars or more.