Pros: Inexpensive and it really does what it promises.
In a nutshell, this product is awesome. Like the title says, I can NOT live without this stuff. I ran out a few weeks ago, and for some reason, I kept forgetting to pick some up whenever I would go out to do my shopping. When I finally did re-stock, I couldn't believe how much I had missed it. My hair behaved better, it looked smoother after blow drying it straight, and it just plain felt better to touch. And as a side note, I have really long, naturally wavy/curly hair, so for this product to work so incredibly well is practically a miracle.
And I don't understand all the "messy" comments. All you have to do to apply it is this: After shampooing your hair in the shower, once you get out, just flip your head upside down over the side of your tub or shower and squirt the product directly into your hair straight from the bottle. There's absolutely no need to put it in your hand and THEN on your hair. Don't make it more difficult than it needs to be . lol
I honestly have nothing negative to say about this product. I try to make it a point to always use the entire line of Infusium products (the moisturizing shampoo is the best). But even when I occassionally switch up, this is the one thing that doesn't change.