I've had dealings with Ambeo, and, sure, they're new, but they make the effort and take it seriously. I've seen no evidence of any corner cutting whatsoever when it comes to safety- they (quite rightly) toe the line. The chap who runs the ops is very experienced, which helps a great deal I think. They have one or two low-ish hour co-joes (I have no idea as to actual figures and may be talking out of my hat) but I have seen firsthand that they always put them with an experienced captain.
Personally, I wouldn't have started a charter outfit with Mustangs, but that's just because of the range when you're 3 or 4-up. They are however new, modern and safe aircraft, and cheaper to operate than CJs.
Also, I know that they are fairly busy, and that's always a good sign!
