7 out of 10 points and recommendedUsable wide open, very large aperture, balaced with XSI, compact, great price/performance ratioIt's a DC lens so no FF support, Corners are visibly soft in any aperture
First of all this is not a prime you should always use on your camera. I have Tamron 17-50 F2.8 also and I can say Tammy beats this fat kid at F2.8, F4.0 etc. This is a very special lens and you should consider it that way. No it's not a lens for nature (corners are really soft) or portrait photography IMO (30mm is not a good focal length for portrature). So what is this chubby for then? This lens is for Low Light photography guys. If you are gonna use it with F2.8 no do not buy it. Buy Tammy instead plus you have variable focal length. But for indoor photos in general, baby or kid photos, concert photos etc. Where you don't wanna use (or you are not allowed to) use flash this gem rocks! You can take very usable photos even wide open and at F2.0 or F2.2 it really differs and gets better. So no it's not a perfect lens. But it has really important flaws though, in it's own kingdom, this king rules with pride.reviewed September 4th, 2009 (purchased for $500)
p.s. Consider it there is no real alternative product to this lens in this price segment. So if you are sure this is your lens then buy it.