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Owner reviews: Tamron SP 45 mm f/ 1.8 Di VC USD
Overall very good build qualIty, excellent fit and finish, and quite nice image quality. Image stabilization in a "normal" focal length lens is virtually unheard of, and it works quite well. Bokeh is round and quite smooth. Sharpness wide open is respectable and improves up through about f/4. Vignetting is prominent but easily corrected in post processing (or not, because it actually looks cool). Contrast and color rendition are what I could call "standard".
Chromatic aberration is the weakest point on this lens. It is easily controlled in Photoshop or Lightroom, however, and doesn't pose a major issue.