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I think some people are more sensitive to eye placement on certain eyepieces than others. I have all three of the T4 Naglers and find them very easy to use and prefer their 82 degree field to that of the T6 series. The only Nagler I have ever had eye placement problems with is the original 13mm (now known as Type 1). I still like the 13mm Original very much and prefer it over the T6 for the field simply appears wider to me as it does too in the 12mm T4. In fact the 12mm T4 has almost the same true field as the 13mm T6 as there is only 0.5mm difference in field stop diameter.
The phenomenon is known as spherical aberration of the exit pupil. The Type 2 Nagler onwards had this corrected for most part. I don't own any T2 Naglers but have looked through the 12mm and 16mm many times a long time ago and cannot remember any eye placement issues with these.
Everyone can only look through their own eyes and what one person has a problem with the other may not and vice versa. The best solution for anyone contemplating getting any new eyepiece is to try one perhaps even in their own telescope at a star party or if that is not possible then at least at the store that sells them before they buy anything.
Whatever you choose, enjoy!
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