I have the 28-300 on my D700 as my walkabout lens. Although, my most used walkabout kit is now a Lumix m43 camera because it is so light and small. Anyway, the 28-300 is a fine lens (not great as in Nikon's 24-70) but a good IQ performer. My main issue with it on my D700 is that the slower aperture at the long end (f/5.6) makes for quite a dim view in the viewfinder, especially on a dull day such as we often have here in Scotland. I went and tested this yesterday to see if I was imagining it. I put the 24-70 on the D700 and set the aperture to f/5.6 and used the depth of field preview button to close down from f/2.8. The loss of light is really quite noticeable, so much so that I can see the 'grain' of the focussing screen in the viewfinder. I don't know if that is just me and my example of this lens. Perhaps others will comment, but certainly going from the 24-70 to the 28-300 reduces the overall brightness in the viewfinder quite a lot. In Mexico, this may not be so much of an issue where you will have more sun than here !