From what I have read on the birding forums the Vortex UHDs compare favorably to the Swaro’s, but never buy them new. Resale on the Vortex is crap, the Swaros will keep their value. I have the NLs and love them, but of course they are overpriced.I had thought about vortex uhd’s but figured if I was going to spend that much I had just as well go all the way so I don’t want to upgrade again for quite awhile.