Hello, thanks for your replies so far, although they don't really answer my question. Obviously I have written either too much or too less.
I'm from Germany and we are feeding our budgies a bit different than you do. More like the wild ones eat. Wild budgies do not eat any fruits or greens, especially in the non-breeding-season they live in some kind of desert!
So, our budgies do get greens etc., too, but not on a daily basis and only in small amounts. More like an additional treat than as a real part of the food.
Pellets are not yet very common in Europe, but I'm always curious, so I gave it a try (although quite sceptical) - and the outcome was not overwhelming, but good, so I stick with them.
My question was: has anyone experience in feeding only pellets and no seeds as main dish?
That is what the manufacturer recommends, even for budgies (I have asked).
But I would be very interested in "neutral" experience.