I've used both dairy and non-dairy creamer, but now I usually just use a splash of milk. I've been trying to avoid creamer and I always have milk on hand anyway. When it comes to non-dairy creamer, Coffee-Mate is still one of the better ones, in my opinion. It's just too pricey though, often costing three times as much as other brands. Of the liquid varieties, I only buy that if I want flavored, and I prefer French Vanilla.
I use coffeemate every day. I like it the best out of all the dairy creamers available. I buy it in the larger bottle (2 qt. I think), it is way more economical than buying the smaller sized bottles. I don't put too much in my coffee, just a splash, so it lasts me quite a while.