I just received these and love how they stack and are color coordinated....all a big plus.  They also feel very sturdy and I think the quality is great.  I only rated it down 1 star because when you put the cover on you don't get any sense of a finite snap, or close to it that lets you know it's sealed tight.  At least the ones I got it seems like you just have to keep pushing the cover down tight on all sides till you can see it meets the little lip around the top.  I actually have to look around all sides to know for sure that the cover is on as tight as it can go. I find that a bit annoying.