I have the same 5906, with the square trigger guard.
They are built like a tank! It's too heavy for me to carry (I'm pretty small) but I will NEVER sell this pistol!
I love the fast sight acquisition of the 3 dot sights. I love the super smooth DA trigger; the best on any semiauto pistol I've ever shot, or handled. I love how the weight soaks up recoil, making follow-up shots so fast any easy.
Plastic pistols have a place, but they lack the character and feel of quality that an all metal pistol has.