You should probably post this in the SeaLife section to get more feedback, but I've been a SeaLife user for a very long time. Though, I am currently in the process (just finished buying the rest of my setup today, actually) of upgrading to a G7x ii. SeaLife's are great cameras. If you look at my links below, every underwater photo was taken with a SeaLife. However, as mentioned above, it depends on what you want to do. The DC2000 extremely simple to use and it takes great photos for its price point, especially considering you get a full 1" sensor, full manual control, and RAW.
Unfortunately, the reason I'm switching is because it lacks an optical zoom, and the large majority of my photographs has always been macro (though I'm now expanding that to more wide angle). You can still get very good macro photos with it, but a physical zoom just wasn't something I was willing to sacrifice for what I want to do, especially since I'm going to Raja Ampat and Lembeh in March. If the DC2000 had an optical zoom, I'm 99% sure I'd be sticking with them. As for Landau's complaints about it, I can honestly say I've never once had any of those issues. Changing shutter speed and aperture takes only a couple clicks, and you also have a hot key that can be set to whatever you'd like quicker access to as well. Also, any time you delete a photo there is a confirmation screen, so you'd have to try VERY hard to accidentally delete a photo. In several years of using these cameras, I've never had that happen a single time. Hell, I've never even GOTTEN to the delete screen.
So, with that being said, not everyone needs a physical zoom, and having 20 MP leaves you plenty of room to crop. So, the DC2000 is still an outstanding camera for a lot of people. If you want something light and easy to use that gets great photos (with a few limitations), and without spending a huge chunk, I think you'll love the DC2000. Not to mention, as a company, their customer service is simply second to none. Flood your Canon or it's not working right? Good luck with that...lol.
If you have any specific questions about it, feel free to let me know.