Totally worth it!
Before finding this kit, it was really hard finding a seed tray narrow enough to fit on a windowsill. This is exactly what I was looking for and more!
It's sturdy (as others have said), relatively slim, and well-designed. There's a "support platform" that raises the seed tray so it's not sitting in water, and you can probably use the pointy legs of the platform as dibbers too. Plus, the humidity dome fits/stacks under the bottom tray, so you don't need to store it separately. Each cell has a center hole big enough for a (small) pinky finger to push out the cell, and 2 smaller holes. The kit is also dishwasher-safe, according to the packaging.
As a balcony gardener, this kit has made all the difference and made my seed starting set-up look way cleaner and more organized. Not to mention that ordering from WCS means you can also get fun seeds and other supplies. Totally worth it!
C