I have been downsizing lately, selling watches at a loss to end up with fewer, better ones. The exercise clarified what I actually want: good engineering, clean design, and a watch I'll wear instead of leaving in a drawer. That kept pulling me back to one memory. The first Audemars Piguet I ever handled was a Royal Oak a friend received as a business gift a few years ago, and the finishing was visibly better than anything I owned. I never forgot it.
Two things had kept me from buying my own: the price, and the fact that the 41mm Royal Oak wore small on my wrist. The Offshore fixed the second. It's larger, sportier, and was a touch less expensive than the standard Royal Oak.
Case and wearability
The watch I bought (Ref. 15710ST.OO.A002CA.01) is the Royal Oak Offshore Diver: a 42mm stainless steel case, 14.1mm thick, water resistant to 300 meters. It wears well on my wrist without feeling too big. The Offshore is chunkier than the regular Royal Oak, more tool watch than dress watch, which suits how I actually live.
The case finishing is where AP earns its reputation: sharp angles, polished and brushed surfaces in the right places, tight tolerances. There are two screw-locked crowns, both with prominent guards. The one at 3 o'clock sets the time and date; the one at 10 turns the internal diving bezel. It's thicker than the standard Royal Oak but still fits under a casual shirt cuff.

Dial
This Offshore isn't a chronograph. It shows the time and date, with a dive scale on the inner rotating bezel. The "Méga Tapisserie" pattern is an enlarged version of the Grande Tapisserie on the standard Royal Oak, and it gives the dial real depth. The hour markers and hands are large and lumed, so it reads well day or night.
I usually prefer chronographs, but I've come around to cleaner dials with fewer subdials crowding them. This one works.

Strap
This reference comes on an integrated rubber strap. I generally prefer metal bracelets, and my Vacheron Constantin Overseas set a high bar there. But AP's rubber strap is comfortable and looks like it belongs on the watch. The integration between strap and case is well done. I did buy a stainless steel bracelet for it, and it fit perfectly.

Movement
The caliber 3120 is AP's in-house automatic, with about 60 hours of power reserve. The sapphire caseback shows a 22k gold rotor and Côtes de Genève finishing on the bridges, and it's worth looking at. The decoration matches what you'd expect at this price.
Bottom line
Owning this watch has made clear why AP, Vacheron, and Patek command the prices they do. The finishing and construction are genuinely better than watches several rungs down, and you feel it every time you pick it up.
The Offshore Diver isn't the usual first AP for most people; the standard Royal Oak gets more attention. But if you want something sportier and a bit larger, with 300 meters of water resistance you'll probably never need, this is a solid option. It's become one of the watches I reach for most.