Know what you're getting into...
We have twins, and these were great for us.  It was a pain to bathe one child in the plastic tub and then swap.  The key is with this is knowing how to use it.  I found that if you put too much water in the tub, the pillow tipped over.  Before my babies could sit up, I laid them on the pillow, just like a boppy.  The water level wasn't too high and they were safe and comfortable.  When they were able to sit up comfortably, I positioned them just like the photo, and it was great.  Again, keep the water level low.  When they were able to stand/move around, I got rid of them.  I agree that they are heavy and bulky - that was my chief complaint.
Rating: 4 stars