I recently purchased 3 Doxa Sub 200s. 2 were gifts for my Dad (Sharkhunter) and brother (Caribbean). I went with the Aquamarine just to keep each watch in the set unique. We are all very pleased.
The movement isn't anything to write home about but I love that in a Diver's watch, it's reliable and affordable to service, exactly what a dive watch should be.
All 3 are on the BoR bracelet which is comfortable and looks great. Don't pay attention to gripes about the diver extension, I don't even notice it and am a believer that with the exception of the Pelagos spring system, diver extensions are mostly laughable gimmicks.
I'm not a huge fan of Fauxtina but the Sharkhunter and Caribbean wear it pretty well. The Aquamarine was a way to throw a splash of fun color into the collection and makes an excellent summer watch that dresses up nicely on the bracelet.
The 19mm lug width is a non issue. Plenty of cheap good options out there on the internets. The aquamarine looks great on a canvas or rubber Barton strap. The factory aquamarine strap was way too showy for my taste.
The lume as stated before isn't great but it is slightly better on the Aquamarine than the other two.
I wouldn't hesitate to buy them again. It's a great way to get into a Doxa and a vintage inspired dive watch.
If you want to stick at the same price point but get something resembling most of the Doxa dive watches, check out the new Synchron watches. Specifically the Poseidon model intrigues me since Poseidon is a legitimate scuba gear company although I havent done my homework yet on the current state of Synchron. (Time to open the can of worms on Doxa/Jenny/Synchron!!!)