3 out of 10 points and not recommendedLight, small, metal mountSlow AF, poor wide open, it's a prime
Wide open is poor: not really sharp even in the center (much less than the kit lens) and it's darker than the aperture would suggest: at f1.8 it's t2.1, let's say t2 to be optimistic. At f2.8 it's sharp as a knife.reviewed January 7th, 2013 (purchased for $250)
This means that it's just one stop faster than f2.8 zooms, of which the Tamron is just a few €s more.
Unless you are a fanatic of primes, you would be served better by a midrange f2.8 zoom. Planning to sell mine shortly.