It has a 65 degree field of view, not 50 and its surprisingly light despite its humongous size (like a large hand grenade). I bought this instead of the LVW42 which would have produced an exit pupil too big for me on my refractor. The field is very sharp edge to edge with my Orion 102ED f/7. A very very nice eyepiece.
I read somewhere that Vixen will cease production of the LVW series and replace them progressively with NLVW. The 30mm is the first, and there is a 50mm as well.
http://web.me.com/nicholas.loveday/Site/Misc.html#0
From what I have seen about the NLV they're the LV design with some tweaks and new coatings. They'd make a nice set for a modest telescope if you didn't want to pony up the $ for Naglers/Radians/Ethos.
Also good for taking to a public star party - leave the expensive ones in the car.