I like some products from some lines and some from another.
In fact, if you were to look into my bathroom drawer, purse, or shower - you would find very few items that were from the same cosmetic "line".
Now that being said - once I find something I really like I usually stick with it for a loooong time....I may veer away but I typically come back to what works well.
So girls - shake it up a bit you don't have to use all items from one specific brand.....be loyal to your friends don't worry the products they won't get their feelings hurt!!