This one's been on the back burner, for me, for quite some time. Since it's available in Sony a-mount, and the newer Tamron 18-400 is only available in Canon and Nikon mounts, I've been considering it. But, both the reviews, and comments here, regarding this lens, have been a mixed bag. Sony lenses are quite pricey, and thus - apart from those I already have (18-55 SAM II, 16-105 DT, 18-250 DT) chances are, I won't be getting anymore (apart from a macro or two) but this is one Third Party lens, I keep coming back to, again and again. It's wide enough for most applications where one needs a Wider Length, but only if that 16mm REALLY IS 16mm. But, I suspect it really isn't. So, I am interested to hear from those who have it, use it, and have figured out what it really IS, on the wide end. Also, I'd like to hear your reflections about its performance on the long end, too. Of course, I am considering it for my Sony SLTs, but if you have it on a Nikon or on a Canon - I'd also like to hear your reflections. Best money you ever spent on a lens, or no?