I have the same model (#999104?) only with a shorter barrel (4" vs 4.5"). It was a mistake on my part, but I'm glad I did. The #999044 has a better feel overall and shoots more smoothly. With a full magazine, it balances better. I haven't fully broken it in,* so the slide is still a little stiffer than my first.
-Both have that awful trigger that tears up your index finger.
-Both use the exact same polymer body.
-The 104's detents are set better, but both don't expose them.
-The 044's breakdown was more difficult, requiring a little more elbow grease.*
-Double action performs well, but the #104 is a little smoother.*
-The 044's breakdown did catch me by surprise. While reassembling, I had to lift the slide a little, because the ejector got in the way.
-The barrel's ramp is a little more square, but I had no problems with cycling.
[I don't know why I write these things, because I really doubt anyone reads them; still, I hope at some point this analysis will prove helpful to someone.]
Rating: 5 of 5 Stars!