My BBI "Hartman" Bf-109 came out pretty good:  
The canopy on mine is an issue solely because it doesn't "lock" like on the 21c Bf-109 and is a bit loose.  Depending on how I sit the pilot, it may stay open a little as you can see in the above photos.
Otherwise, I have very few complaints about this piece.  No glue issues, no loose parts, no warping.  I saw another one out-of-box at my local Hobbytown when I got mine and it looked just as good...  
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To answer BD1's question, the BBI Hartmann Bf-109 one of my best-looking WWII German planes in 1:18 and blows the 21c Bf-109G out of the water in nearly every respect.  Here's a picture of the two planes together:
...and all three 1:18 BF-109 toolings - 21c ME-109E, BBI Bf-109G-2, 21c Bf-109G-6:
