I love these feeders. They are extremely easy to fill. Just pop the lid and pour the seed into the large opening. No more messing around trying to open the top (untie the knot) like the ones on the old string top feeders. Just click and pour. The top has a huge opening with a solid plastic ring around it so no more trying to keep the bag open with one hand while pouring seed with the other. Another nice feature is the wire hanger. It's very sturdy and attached securely to the feeder top.
I highly recommend these feeders.