Durability is more than bad

I have equipped our hall on the ground floor and top floor with the LED lamps. In total there are 7 lights and I am absolutely satisfied.
The lighting is good and there is a pleasant light.
There were previously 40 watt incandescent lamps and 11 watt energy-saving lamps installed.
These LED bulbs can be classified by light aside by the 50 watt incandescent lamps because I noticed almost no difference there.
The light is as expected yellowish because it is the warm white version.

The lamp body makes a wobbly impression. You can move back and forth, the LED rows. The screw (E27) is, however, processed stable and firm.

So far, no failures.

Price / performance -> Toll
Purchase recommendation

Addendum:

It has now broken the second lamp. I hope it remains that I have some installed it.

The service provided by the seller, however, is simple and fast.
I have an e-mail sent the defective lamp and it was sent a new immediately.
So should service be (I think the problem with the bulbs is well known)

Addendum:
Meanwhile the fifth lamp is defective.
Although you get sent a new, but that it can not yet be.
I checked the versions of the ceiling lights and the voltages on all versions measured.
No wire breakage or any other defect in the ceiling lamps recognizable ...

Addendum:
I now have all the bulbs replaced by others subjectively considered beautiful shine and so far not had a failure!