Over All Rating Reviews : 
I bought the 3-pack of black v-neck CK's via Amazon in May'09. I purchased men's size "Medium" based on the fact that I bought the same 3-pack last year in size "Large" and the fit was bigger than I wanted. I am 5'10", 195lbs and usually wear a size "Large" in most men's tops.
In terms of sizing I was looking for a fit that is slightly snug versus too baggy (as the Larges were for me) so now that I have the size Mediums they are working out much better for my preference (especially since I've noticed they also tend to stretch out a bit over time). Bad news is I have 6 of these tshirts clogging up my dresser drawers now, good news is since I have the Medium and Large sizes I can gain a few pounds and I'm still good to go (beer me).
I do agree with some other reviewers that CK tshirts do tend to be thin material and they aren't your typical stand alone t-shirt you can show off about town. They are good tshirts under another piece of clothing, as pajama top, or working around the yard. I actually like the fact that CK v-necks are thin because they are very comfortable to wear for incognito usage.
Style-wise a good looking t-shirt with nice looking v-neck shape.
Overall: 4 out of 5 stars. High marks for looks and comfort for my intended usage, minus 1 star for the slightly strange sizing causing inventory buildup in my dresser drawers.
I hope you found my review helpful.
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Calvin Klein Men's Basic V-Neck T-Shirt, 3-Pack.