We have examples of the way things are or should be, it looks good until we test it.
I remember purchasing some clothe a while back, the seller assured me that the clothe would be a perfect fit. I doubted but after much persuasion, I bought it hoping it would fit me perfectly. I was disappointed at the outcome when I sampled it, it was not perfect at all. I learnt that sampling something is very important, at least you get reassurance after the sampling.
So, always sample it.