For some, Airports can be dreadful if you have long layovers or have to spend the majority of the day there for whatever reason. Before arriving in Korea, I had an 8 hour layover in Istanbul, Turkey and it was horrible. I've spent more hours than that in Dubai (11 hours) and they went by much quicker than the 8 in Istanbul. It all depends on the size of the Airport and what they offer. Istanbul was ridiculously expensive with everything sold in Euros. Thank goodness I saved my two bottles of wine bought for me by a Turkish passenger sitting next to me on the flight. Those wine bottles and a good book made the time a bit more tolerable since ONE cocktail ranged from $16-$19 and everything else was above my traveling budget. The wifi wasn't free, cost about 1 Euro but required credit card information and if your bank is like mine and suspicious of every country then a layover in Istanbul won't count as part of "traveling" and most likely block that transaction.
Welcome to Korea!! Not only is there free wifi but there's also an internet cafe where you can relax with a big desk and comfortable seats. I would advice to carry a personal small transformer fit for your phone or laptop since they don't provide those there. The cafe doesn't have a time limit and its only restriction is bringing in outside food or beverages. Speaking of food and beverages, there are plenty of places to eat here including food courts. For those who prefer American franchises, you can get them here. I haven't explored the whole entire Airport from Gate 1-14 (pretty decent sized airport) nor all the 3 floors but I did find a Jamba Juice, Dunkin Donuts, McDonald's, Quizno's, Subway, and a Baskin Robbins. If you are a shopper, you can find a duty free with nice brand name items from cosmetics and perfumes to apparel and gifts. There is also entertainment here. The day I arrived was a live Opera show and it was really nice and lively. Overall, I give this Airport a thumbs up for cleanliness, easy to maneuver in, excellent customer service, friendliness, food, and entertainment.