The Kodak 1400 is a dye-sublimation printer which produces continuous tone prints that are indistinguishable from photographic prints. This is by contrast with inkjet and laser prints which use individual dots to produce colour. Although photographic inkjet printers are now extremely fine, there is still a perceptible difference if you look carefully enough. The Kodak prints come out on genuine Kodak photographic paper, and, in their main advantage over photographic inkjet, they are also laminated with a very fine coating which protects them from damage.
There are lots of dye-sublimation printers on the market, but most produce only small prints, typically at a substantially higher price than you would pay at a lab. The Kodak, by contrast, prints on paper up to 216 x 356 (ie, this size), with an image size up to about 212 x 310. There are only two choices of finish -- gloss or matt -- which will disappoint professional photographers who may have a different preference. This particular size of paper is only available as gloss.
If you want to print up to A4 size, it is essential that you buy this size of paper, and not the A4 size! This is because the printer has to grip the paper, and to do so it has a maximum imageable area which is marginally smaller than the width, but substantially shorter than the length. If you want to print on A4 with quite a large border -- for example, to place in an A4 frame -- the A4 size will probably suit you well. If, on the other hand, you want to fill A4, you need to go up to this size.
That's it, really. Cost per print is about £1.50, which compares quite well with a pro-lab's prints at this size, and is cheaper than the £2.00 or so to print premium inkjet prints on premium paper. The quality is first rate, provided that you keep the printer clean. If you don't, then the images degrade, especially if you don't use it for a while. Fortunately a bit of cleaning and care are all it needs.