update 6/14

I've had this set now for over a year and must say that its holding up really well. Had to get the zipper replaced on one of the outer pockets since it broke off, other than that no damages. The wheels have been great on all kinds of surfaces - gravel roads, carpets, concrete, polished floors and others. Buying another set to gift!

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For someone who travels 50% of the time with 4-5 long haul international trips a year, I was on the fence for a long long time before I went ahead and invested in this set. It turned out to be a great buy! Based on my recent experiences this is what I'd say:

Pros

Lightweight and sufficiently sturdy - survived being shoved around and thrown around in buses and planes
Very spacious - thanks to the extension I got an extra couple of inches and could pack in enough for a week in the smallest bag
Handy pockets - the little pocket on top is pretty handy for odds and ends within easy reach. The largest flap is great for books, stationary, and even held my laptop a couple of times. The third pocket might not be functional if you have a stuffed bag.

Cons
Wheel alignment and balancing -- I noticed that if the bags are not evenly packed, they do tend to topple over or have trouble in staying upright.
Handle - the handle seems a bit flimsy and I was afraid it would snap off the first few times I traveled with the bag -- but its held up very well.

Would definitely recommend this set - for less than 40 bucks a pop for a spinner - it could not get any better!