I bought this lens as a result of seeing images posted on the forum as a travel lens. I had a chance to try it out over the weekend on a drive through the San Jaun mountains of southwest Colorado. It needs to be stopped down to at least f/5.6 to 8 and at the long end it needs f/11 or more. I avoid using it past 180mm as it becomes unacceptably soft for me. It's really an outdoor lens (or flash), but does provide very nice images if used within these limits.
Here's a shot from Durango, CO and a 100% crop at 33mm and f/8. (Compression for the forum is causing some pixelation issues.)