Haven't had an issue with the Allflex preprinted tags.  Oldest ones are 2008 models now and still plenty legible.  We did half that year written and half printed, they beat any hand written tag.  We get the matching round EID which also has the same color and since we change colors every year isn't too hard to at least tell what model year the cow is if she loses the big tag and can then scan the EID and see who she is.  My only complaint is they only print number on one side, nice to have a number on the back every now and then.