Conclusion: I like the 18-135 mm range, it covers most normal scenarios. It is fast focus and reliable. However, when taking pictures in low light, does not performes well. Ex: museum with low light, old paintings etc...
Pros: Fast auto-focus, Superior build quality, nice zoom range
Summary: I bought this lens seperate from my canon rebel t4i camera... I heard that the stm lenses worked great for automatic use. This lens takes great pics, auto or manual. Focus & zoom great... this lens feels, look & operate the same as the canon 55-250mm lens. I don't know if its just my camera... but using this on automatic mode taking pics & video... This lens is very loud & constantly adjusting to focusing... takes so long. I rather use this lens on all manual mode.
Conclusion: I have had this lens for almost 2 months. When I got my T2i, I was not impressed with the 18-55mm kit lens, so I bought this lens. It has the focal length that covers most of my shooting needs when I travel. It is light weight, quick AF and feels good in my hands with the camera. I use it mainly for landscape, buildings, wildlife and I have not been disappointed. I do not use it indoors or in low light, for that I have the CANON 50mm, f/1.4 USM.
Pros: light, good focusing, quality construction, very stable at distances