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I have used losts of eyepieces over a long period of time. Simple fact is you usually get what you pay for. Its worth noting that some Naglers are better than others. As they incorporate different optical designs and parameters over different focal lengths. For instance, some of the earlier Naglers were not comfortable to use and also suffered from Kidney beaning and blackout, this manifests more in some observers than others and generally is more apparent to less experienced observers. Its also worth noting that a lot of Naglers have fairly short eye-relief and may not be all that suitable for people that wear eyeglasses. For instance the 24mm Panoptic is optically the best eyepiece available in that focal length but eye-relief is tight, hence for me the 20mm Pentax is a better option having 20mm of eye-relief. Some other Naglers namely the 12mm, 17mm and 22mm T4's have more comfortable eye-relief but the compromise here is that they sacrifice a little in edge performance (compared to the t5's) to obtain the extra eye-relief.
In the shorter focal lengths (under 14mm) which are mainly used for higher power observations the Pentax XW's are just as good as anything Televue produces. Actually to me they are better because they are a "lot" more comfortable to use than the NT6's for an eyeglass wearer and optically they are just as good, fractionally smaller FOV which you don't really notice, offset by marginally sharper on axis images with higher light transmission. But we are splitting hairs here, both the Pentax XW's and the Nagler T6's are absolutely outstanding eyepieces.
CS-John B
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