I would only really worry about it if the PS pump Hoses and seals are original and if you have a mixture of different type fluids mixing around inside the system. Different types of fluids don't mix very well, no matter what they say on the bottle. Just like italian salad dressing, they will tend to seperate in layers untill it's "shaken up", so to speak.

If the parts have been replaced and you used the Universal stuff from the begining, then I wouldn't worry to much about it.

I've found it's cheaper ($$$) using Type F though. I can buy a quart of Type F for about the same price a pint of Universal PS fluid costs.