Trading in my 2tone GMTIIC for AP15450

[vant1472]

Hi TRF,
Is has been a longtime since I post.
I recently bought a Rolex Hulk and
I don't want to have two Rolexes. The
AP I like is the Royal Oak 15450 and I
want to trade in my GMTII for it.
The AP is pre-owned and cash from my end also.
This would be my first AP and worry about
service cost and reliability.
What are the pros & cons of owning AP?
Thank you for your time