Like most other reviewers, I thought long and hard about buying this lens. For me it was about the fact that I had never owned a prime lens before and that I worried about being limited to the one prime lens... Would I find myself wanting to constantly pull one of my zooms out of my pocket to take the shot? Now after owning this lens for a few months I can say the concerns are gone and I find that this lens is more attached to my Canon 50D than any other lens I have owned. This lens is just amazing! I was also concerned about the "crop factor" of APC sensor size... this has been talked about a lot in relation to lens focal length. I just don't understand the problem with this lens. The quality of the shots you can capture far outweigh the fact that an APC sensor size digital camera is not a "true 50mm". I guess I can understand some people's argument that this isn't a good "walk-around" lens for indoor use (because it's basically an 80mm lens on a camera the size of an APC sensor), but all you have to do is step back from your subject a bit and you'll be fine. Plus, its low-light capabilities far exceed any other similar lens, which is a big plus indoors. A good photographer wants to “fill the frame” anyway. I loved this lens indoors. The depth of field this lens can achieve really opens up the creative possibilities. However, I've found that the images lose a bit of sharpness when wide open at f1.4, so I've resorted to shooting at f2.0 when I want to open them. I swear you could focus this lens on a pinhead and I'm amazed at the bokeh (background blur) produced. So far the only negative I have is when I switched the lens to manual focus... I had a hard time getting it to focus properly. But to be honest, that might just be me and my skills at the moment. This lens is truly a must-have for any photographer of any skill level. Your creativity will increase and your shots will amaze... I promise!