How far do Claydon users wear down their bean spoons?

[Bumble Bee]

Our bean spoons are wearing down very quickly. The spoons on the right of the picture have done around 50 ac.
There is plenty of meat left in the middle of the spoon, but the wing seems to wear off in no time at all.

How far do other users wear them down?

 

[Andrew K]

Prefer to use the bean chutes and tungsten points myself for that wear reason, and deeper sowing capability with bonus of lower disturbance.