The coaches they have available at Bottrop are top of the line. I would pay that fee without remorse cause I know them. You might just ask the front desk which one will be there during your booked times and then find out more about them. They can also help you get in touch with them beforehand. You'll be surprised at the level of experience there.
I agree with Itchy- I worked with Mike Cummings a few times and he's over there right now. Very patient- which is good because I'm not the best.... by any means... he was great. he can spot any flying I do believe. So, if you work on head down, I'm pretty sure he'll work great with ya.