FlyGuys are cool.
Like any job board, it is a mix of types of jobs and pay-scales but I find them mostly very reasonable. I have been doing stuff for them for 2.5 years. Jobs have ranged from ortho-mapping, to videos of landscaping, to taking photos of parking lots, facade inspections, etc.
They have a decent portal/dashboard for uploading assets so delivery is easy. Instructions are always clear and the people I have interacted with there are easy to work with. You don't need to invoice them either and their payment system is automatic after you make delivery and job approved. I've never had to do a re-shoot with them and they seem reasonable with their expectations.
I see from my dashboard that I've done just over $8,000 with them across 45 jobs so an average of about $175 per job. I am pretty quick and most of these jobs take me less than 15 minutes. I had a couple mapping jobs that were closer to 20-30 minutes.
Feel free to ask me any other questions about them but I would not hesitate to work for them. Not much of a downside, you always know what the job entails and what the pay is before accepting.