New product well, too many disadvantages

The new Grass Shears with full battery deserves first 5 star. The battery life is good, the scissors cuts well and accurately.
BUT: on lawn edges are too sometimes earth and small stones. The blade wears out in double quick time! Battery charging time is over 5 hours in contrast. Grass snippets penetrate into the housing and, together with the grease a nasty mush. The knife is as good as not to sharpen. At the overlap of the blades wear is so strong that a gap is formed, penetrating into the grass and then crushed. All drive components are made of plastic.
The replacement blades offered cost 29.90! Way too expensive for the service life. It is only available together with the housing part, although the expansion is simple.
The grass trimmer should come with spare blades, and the blades are sold separately for 10.00. Along with a better charger a recommendation of the product would then be acceptable.