the biggest
problem is people using different rollers looking for the highest result whether its accurate or not. I like using rollers to see performance gains after modifications or comparing two cars on the same day (just for fun), but not for finding out what power my car is running so i can go down the pub and shout about it, (even though i probably would)
in the past iv seen how people seem to change their persona at rolling road events, opinions change and soon relativity goes out the window. Most people are naive and if its good they'll shout about it and if its bad...well you wait for the excuses don't you. Not that there aren't any viable reasons for low figures, if they are logical then I can accept them e.g. heat soak
but usually poor figures are followed up by a barrel full of silly excuses
so in essence...no i dont have much faith in RR figures, but they can be useful at times