As simple as it may seem, the traditional "smoothie" vibrator has been a mainstay in the sex toy biz for years because it works. As a result, Dr. Joel has created the 6.5" and 4.5" Intimacy Massagers. They are smooth, seamless, very powerful and have a bit more girth than other "smoothies", which can be good if you prefer a fuller feel.
These vibes are suited for both anal and vaginal stimulation. There is nothing wrong with loving the classics.