I have a 6mm Vixen LV and it's my most expensive eyepiece. It's an absolute pleasure to use (especially compared with the GSO Plossl of the same focal length which was awful). No doubt it doesn't compare to a Nagler though!
I would however also advise not going below the 6, as I find that whilst I use it a lot more than my GSO 6mm, it only reveals more detail than my GSO 9mm Plossl on nights of reasonable seeing (doesn't need to be excellent seeing though).
The smaller the focal length the less often you will use it. I intend to get a 9 or 10mm LV at some point which I suspect I will use every night I'm out there.
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