@ gordi, you can ride anywhere in the world with avid brakes…. just the same as you can ride anywhere without brakes. doesn’t mean that there are not better brakes out there.
i agree with northwind… they are expensive compared to other brakes and their performance doesn’t match their asking price. as a guide i have had lots of problems with avid brakes: complete loss of bite point; brake pads locking up against the disc when going from cold to hot temp; leaks.
not encountered these problems with other manufacturers. only seen boiled brakes, but that is down to user error.
i only have these avids as they came with the bike (Boardman FS).