Arguably the most important advantages of such feeders are:
1. In contrast to the nylon nets of fat balls, the mesh as titmice can not constrict and z. Disconnect the legs. Comes in the nets before, unfortunately, which may result in death of the bird to the loss of the bird leg and thus in the long run. Here is already excluded by design.
2. Due to the size it can accommodate several dumplings simultaneously. This allows more birds at the same time to the food source and you do not so often ensure replacement.
3. A "dumpling theft" by squirrels or crows is almost impossible. Advantages see step 2.
The processing does not appear to me cheap, but quite robust, so that I can trust her to endure several winters in my garden. The stitches are a good size - not a bird has so problems neither Meise yet Dohle.
The filling is fine and very quickly, the small roof protects a little from weather and, of course dumplings thieves.
Conclusion: My Knödelboy does exactly what he is - and the cost very well and at a price.