For such a popular console (over 70m sold in various incarnations), this is surprisingly hard to get started with. I’d heard that it doesn’t come with a power adapter, but I thought, I’ll just use a USB cable like I do for my Vita. Nope—not only does it not come with an adapter, but you can’t use one you already have. Also, the cable on the official adapter is ridiculously short, so you’re better off buying a third-party USB cable with Nintendo’s proprietary connector, and using an iPhone charger or something (I went with the “Insten USB Charger Charging Cable Replacement For Nintendo NEW 3DS XL”).
Then, if you want to mainly play e-shop games, as I did, make sure you don’t buy the wrong SD card to replace the tiny 4GB one that’s in the machine. A plain old SD card for a 3DS won’t do—you need a microSD card for the “New” 3DS. I only discovered this after ordering an SD card, then opening the back to see my mistake. Here, I went with the “Sandisk Ultra microSDXC UHS-I A1 Card 64GB 100MB/s” … which initially didn’t work. The card comes formatted as ExFAT, and you have to reformat it as FAT32, which may take you some research.
For a device a lot of kids will be using, this is all pretty complicated. It took me about a week and a half of chasing all this extra stuff before I actually had it up and running. Crazy. I gather Nintendo is doing a bit better in the user-friendliness department with the Switch.
I love Nintendo and the 3ds XL is an amazing system with plenty of games and hours upon hours of fun for the user. There are many pros to this product, it's lightweight, portable, easy to use and its just awesome. I've found no cons at all and I highly recommend the Nintendo 3ds xl