Twenty years ago I heard horror stories of successful companies that bought expensive 5-axis machines and then went bankrupt because they could not program the machines effectively.
Luckily software technology has come a long way in the last 10 years, and there are some very good PC based 5-axis CAM systems out there.
IMHO 5-axis is one place where you might consider going with a different CAM system from the 3-axis machines. It depends on the work you are doing. If your 3X machines are doing simple things, and your 5X is doing serious complex work, then do you want your 3X guys using something that is overly complicated, or your 5X guy using something that can't do the job?
Of course, depending on your work, you may find one system that fits both requirements.
But really, the cost is software for metal cutting 5X machines is small compared to the cost of the machine, a big crash, or lost productivity if you buy something that can't handle the job.
Don't go "cheap" in this area or you will regret it. Get what can prove it can do the job, write the check, and keep the spindle turning.
Charles Davis
NexGen Manufacturing Systems, Inc. (www.ngms.us)