It is also fantastic for the most tender cuts as well.
What I use it for the most is tenderloin steaks. As I mentioned above, tenderloins seasoned, vacuum packed, then frozen can be pulled out of the freezer, cooked in the sous vide at 131F for between 3 and 5 hours, then quickly pan-seared in butter. The result is the best steak I've ever eaten, bar none.
And the ease of cooking is fantastic. They come out exactly the same every time. This is perfect for my wife and I because we both work, and are still able to enjoy a fantastic meal regardless of whether or not one of us gets home late.
I, too, highly recommend the Serious Eats site for excellent and highly scientific instructions on all things Sous Vide.
https://www.seriouseats.com/2015/06/food-lab-complete-guide-to-sous-vide-steak.html
The main point of Sous Vide cooking is that you cook to a perfectly controlled, perfectly uniform, and perfectly repeatable internal temperature as opposed to cooking based on time with the outside of the food exposed to a much higher temperature than the actual target temperature for the food.
Check out the articles at that site for various foods.
Does it do everything well? No.
Is it suitable for or better than anything else for all situations? No.
But it is an incredibly accurate and repeatable way to do certain things. It is highly recommended.
To those of you dismissing it without trying it or even studying it first: I don't understand your reluctance to give it a fair chance. If people gave up on all new ideas without trying them, we wouldn't even have fire, let alone smoking or any other form of cooking.
When I met my wife, she had grown up eating only meat her father had caught or killed, and then cooked by her British "war bride" mother. That meant meat was not easily available, and when it was, it was cooked to the consistency of shoe leather.
I invited her to my place for steaks. She hated steak, and was very reluctant. I prepared them as I'd learned to do, marinating them briefly to get them up to room temperature before grilling them starting over hot coals in my little Smokey Joe, which does a fantastic job for small batches, and is highly and quickly controllable. You can get a super high sear at the start, with incredible radiant heat from the raging coals, then cover the grill and close down the vents to get the longer, slower part of the cooking (still very fast, though).
She was amazed! She'd never had proper medium rare steak. She immediately fell in love with steak, a food she loathed all of her life up to that point.
Maybe that's why she married me! Charcoal grill courtship!
Anyhow, my point is that new ways of cooking something can be a revelation. Keep an open mind. Sous Vide wouldn't have any fans if it was bad. Why would a bunch of smoking and grilling fanatics embrace it if it sucked?
At least study it and appreciate it for the scientific and technical aspects. Read up at the Serious Eats site. Everything is explained well and has been researched extensively.
As has been stated over and over in this thread: It's an excellent tool to add to your arsenal. I promise, you won't sail off the edge of the earth and be eaten by dragons. Really.