177, please teach me

I bought my first pam in February. A 177. I love it. It get far more wrist time than my Planet Ocean and Steelfish. However, I have become a bit curious, and this is where you guys (hopefully) come into play

Could you please educate me on my 177? What is the rationale/history behind using titanium in stead of steel? And what about the OP XI movement; is it durable? Reliable? Easy to service? How does it age? Other info about 177 is also very welcome.

Thanks

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