If you don't have an affinity to benzos I don't see anyone having much to worry about. I can dabble with benzos whenever I want because I don't really like that that much or ever will, lol. But if you use meth regularly and begin to use the benzos every time to cope with the stimulant "paranoia" and come-down--it's going to be a bad time.
It also detracts from the stimulant up kind of potency. You'll have to take much more meth if you use the benzos while still dosing the stimulants. As the above user stated, it's probably best to save the benzos towards the end. I actually no longer face any paranoia from stimulant use. That in turn makes it far more addicting to me, as I no longer have walls and limits. So in time that lovely paranoia does in my opinion go away on its own without any benzos needed.