I own two Eagnas machines - a Flex 100 and an Eagnas 860. Both have been fine machines. They are among the best I have ever used in 57 years stringing.
The EAG-860 holds tension, and has not needed to be recalibrated since I set the initial tension when it arrived several years ago.
I often use the Perfect Spin string , and the Poly Nova Titanium 17 string, which have gained a following among my customers.