I have only just seen this, and can only comment on Bisley.
The electronics at Bisley are notoriously unreliable. I've only been back since Tuesday and since then have heard of five breakdowns on the electronics over the radio. When you have a control radio it's an eye opener as to how the electronic targets perform camp wide. I put it down to poor maintenance by Bisley.
As for human markers, there are a few good NRA markers, but they are the minority, ask the F Class guys who were at the Imperial. At least with private markers you are more likely to get what you pay for.
You know where l am