I try not to change everything all at once! I figure changing cleanser is less stressful on the skin than moisturizer, just because moisturizer is on your skin for hours, while a cleanser is rinsed off. I prefer rotating in a new product every 2-3 weeks.
It’s all about quality for me – if a brand is consistently churning out poor quality products, then I’m totally turned off of the brand. I’m also frustrated by inconsistency, whether it is in quality or customer service.