I've had the Serum Bar for a couple of weeks and love it! It took a while to get used to not using toner, eye cream, serum and moisturizer, and to get the hang of warming up the bar but I found the instruction video on YouTube very helpful. I love being able to use the small end to rub in extra product in certain extra dry areas, and love how much better my skin feels, especially on my neck. I'm very happy with my purchase.