In my two short years in this hobby, the only Asian 7750 I have had trouble with is the one modified for seconds at six (do a search). I take it you are a scuba diver. I don't wear a watch period when I dive and I don't swim with my reps. Although I have tested a few (such as subs) and they have been fine. I would definiately check out if a model with chronos is water 'proof'. When I am in the water, I wear my Seiko black monster. The manual wind movement used in models such as the vintage Daytona's is as The Zigmeister once put it, a 'watch maker nightmare' because it is so bullet proof. To service or not to service is also a big question. You are going to spend close to your qouted number for a better rep to begin with and then drop a few hundred more to service it depending on the movement. Some of the asian movements are readily available and are not expensive so many chose to run them until they die and then replace, and perhaps service them, at that time. Remember, you are talking about a fake of a watch that probably costs $10,000 or more. There are some legit reasons why the gens cost more. So I guess what I am saying is, don't expect a $400 copy to be of the same quality as the $10,000 watch it replicates..... although, they can be pretty darn good!