I have been wearing the cheapest Performance shorts for many years and many miles. They fit me perfectly and are very comfortable. Since they, and I, never change I buy them online with no concerns.
My only problem is that the stitching for the chammi and the elastic at the bottom of each leg wears out after about 200 rides and they start feeling a little uncomfortable. But 200 rides for $19 is OK with me.
I also have many high end expensive bibs and short that I used to wear. They are really comfortable and long lasting but I like the Performance for some reason.