I bought this lens for my Canon 20D digital camera and have found it to be a great all-purpose, everyday-use lens.  Here are the best features from my perspective:1.  The range of telephoto zoom is adequate for 90% of photo opportunites.  28-135 mm telephoto in digital photography translates into 48-230 mm in SLR film photography.  Since a standard camera lens is 50-55 mm, the starting range of this zoom lens equals that and then has the added versatility of zooming up to 135 mm (or 230mm in old style camera figures).  In my opinion, this added range of framing a shot gives the photographer so much more creativity, as well as being able to bring objects into closer, more intimate range.  I mentioned that this lens is good for 90% of all general camera shots; the missing 10% are those pictures that require a better zoom (more telephoto zoom), and those pics that need a wider field of view.  You may find that for group photos in close proximity, you want to take a step backwards to get everybody in the frame.  This is not a problem unless you simply don't have the room to take that step back.  I solved this problem by switching back to the original 18-55mm lens that came with the camera.  For the more distant shots that can't be drawn into the 135mm zoom of this lens I purchased a better telephoto zoom.2.  The lens has autofocus and IS stabilization technology.  For one used to manual focus lenses in SLR film photography, the addition of a fast autofocus lens is a terrific feature! I used to miss those spur of the moment shots because I was trying to achieve focus.  With this lens, you make those shots, because within a milisecond of depressing the shutter down halfway, the picture snaps into focus!  I absolutely love this feature!  The focuser has many points of potential focus, so it adapts easily to virtually all focusing situations.  For the really difficult focusing shots, there is the option of manual focusing.  While nice to have, I rarely use this option.  The Image Stabilization feature is a handy one in the longer shots.  "IS" lets one get away with a bit of camera shake without too much out-of-focus smear on the picture.  Canon does not recommend using the IS feature on tripod shots, so there is a switch to turn off the IS if desired.3.  The lens takes sharp clear pictures.  I have not been disappointed with the quality of the lens at all.Drawbacks1.  While there are not too many drawbacks to this lens, I think the major one is that the lens is bigger and heavier, in fact, much bigger and heavier than the standard 17-55 mm lenses that come with SLR cameras.  For me this is not a problem, however, for one that wants to have a lighter-weight camera, this could be considered a serious drawback.  On the other hand, a SLR camera like the Canon 20D or digital Rebel is not designed to be a smaller pocket-sized camera.  It is a larger format camera and of course the lenses will be larger (and heavier) as well.2.  Cost.  At just over 400 dollars, this lens is an investment.  Again, one has to weigh the obvious financial outlay, but the 28-135 mm lens is so superior to the cheaper 18-55 mm lens, that in my opinion, it is well worth the cost to upgrade.With this product, Canon made a great everyday camera lens.  From my perspective, the advantages far outweigh the disadvantages and I do recommend this lens to be your everyday standard camera lens.Jim "Konedog" Koenig 

Question: How do you like the lens?
Answer: I do recommend this lens