Having tried the Tamron 85mm Di VC and returned it due to significant focus shift issues I thought I'd give the 45mm version a try. It also has focus shift, which is common in most fast primes in the shorter focal length range, but it's less obvious and has an acceptable AFMA range in my copy of -4 at f1.8 to +5 at f8 so it's back focusing at its widest aperture and front focusing towards the narrow end which is the opposite of the 85mm lens I tried. This range is more or less 'normal' and I've set the AFMA at a level that works for me.
Interestingly enough both versions are marked as 'designed in Japan' but the 85 is made in China whilst the 45 is made in Japan according to the info printed on the lens' barrels.
Anyway I shall be keeping this lens - it works well, produces nice crisp images with a very good colour rendition. AF speed has been mentioned elsewhere as being a bit on the slow side. It certainly isn't rapid but it isn't what I would call slow and it seems to be accurate and direct, without the very slight stutter I was getting with the 85.
The VC is quite good, not as good maybe as what I'm used to with most Canon lenses, but certainly good enough to make a difference. I don't see any image degradation using the VC that has been reported elsewhere.
Overall I'm very happy with this lens.