I bought this suitcase to replace the backpack I used as a personal item.  I typical fly Frontier and it fits perfectly under the seat.
The sewing construction of the suitcase seems to be of good quality.  It seemed able to hold up to everything Ive packed into it.  The zippers didn't seem like it was about to rip or tear.  But, I do think they need to improve on the wheels and the handle.  The wheels aren't spinners and it easily tips when walking really fast so that was a bit annoying and the handle material felt a tad flimsy.
This is suitcase is small but it holds a LOT!  I was able to pack 2 pairs of jeans, 3 yoga pants, 2 sweaters, 4 shirts, 6 pairs of underwear, 1 bra, 4 pairs of socks, 1 scarf, my 11 Apple laptop, and personal care items such as face wash, toothbrush, etc.  If you're OCD about your packing, there are a lot of pockets and zippers for organization.

Its a nice little suitcase.