Here, spraying is quite heavily regulated. You need to pass a test to handle the chemicals and another to apply them. There's 8 hours of exams there. Then you need to have ongoing training every year. Also the person prescribing the chemicals needs to be qualified, and the training for that is very hard. And on top of that, the machine needs testing every year.

Everyone on here knows everything, so won't need to be trained, so crack on.

The potential for many and expensive mistakes with spraying are almost endless, not to mention public perception of your competence or otherwise, so you decide if you think training is worth a very small percentage of your chemical bill. Some of the complicated pre emergence mixes we have for grass weeds in cereals are £110/ha.

In the land of the free, The Motherships sprayers will be the best things since sliced bread. In the land of the not as free, but free to shop around a bit more, their sprayers have a less than stellar reputation, so go in with your eyes wide open, particularly if you're going to part with a quarter of a million bucks.