C'mon RustyJC, Its time to revisit your evaluations. To illustrate: How many people went to un-timely deaths BC the 10:40 rule? millions BC doctors followed this rule for decades until someone challenged it , Now doctor perform surgery at even 6. Believing that 5ers cannot be converted to GN is old thinking, NOW if the makers will not carry the warranty for GN, I don't buy them. My guess there are 1000s of conversions and I've never seen any failure directly related to GN change-over.