First of all, it's hard to tell from a website what the sizes are actually like, so I took a picture of this insert that came in my containers. I wished the Amazon site more clearly described them or what they look like next to each other. (The picture of all the containers together doesn't explain what sizes you're seeing, so it doesn't help much.)
I have 3 of the 2.4 qt size, 1 of the 4.0 qt size, and 1 of the .9qt size.
Here's the only negative as I see it: The bottoms (the clear plastic part) is not dishwasher safe. That seems crazy to me, but I will probably only fill these once a year or something since I'm using them for dry goods, so it's certainly not a deal breaker. It might be if it was something I was going to have to clean more often. I should mention that the lid comes apart and IS dishwasher safe.
Anything else you want to know about these that I can help with?
*I would note that these get quite heavy when full and though the top seems VERY secure air-wise, I wouldn't carry them around by the top as I imagine the lid coming out. It's not so secure I would trust it. Though I can't imagine wanting to do that anyways because the surface area to grab just the lid would be very difficult.