TLDR: Great set with plenty of options for any kind of travel!I've been on a luggage kick recently, I went on a quick trip where all I brought along was my carry-on- everyone else on this trip had a spinner suitcase and I had my trusty old fabric two-wheeler. Know what? Going completely to the opposite side of ATL dragging that behind me was the pits. I also got gate checked, twice. My trusty case was worse for the wear after that trip, so I started researching. I ordered several different styles of spinner cases to find the right one for me, individually running $100-$200 and when I received these, I sent them all back - and not just because this set is a bargain.These come in one box, Russian-doll style, which means that they're easy to stow away. They all have telescoping handles and spinner wheels except the 14" case. The largest 3 have TSA approved locks and the 4th has a built in combination lock. They're lightweight, but more durable feeling than the other cases I tried. The interiors are well designed with pockets and zippers and those click together straps of holding. I could fit more into the 20" in this design than in the others.There is also a surprising amount of room inside the 14", I was able to pack a pair of jeans, lightweight long sleeved top, vitamins, deodorant, and a thin full sized throw blanket inside without any issue - it's a fantastic one night case - or as it's intended - for your bathroom odds and ends.I love that there is an 18" AND 20", so all of your carryon needs are taken care of. And, you can check the 24" with your fully packed 20" inside so there's plenty of room for the souvenirs on the way home! Or conversely, you can always open the expansion zippers and give yourself that extra wiggle room.The 28" is massive. Looking forward to using that primarily for family road trips - one suitcase to rule them all. Imagine that? Everyone packed into one suitcase in the back of the car, no tetris-ing necessary.