The Billy is a well-designed and well-performing toy. It's a solid investment, and I still haven't gotten bored with it.
I hadn't used many anal toys before I bought the Billy. I'm not a sex toy expert, and I still don't own any other anal vibrators. And so keep in mind I'll be writing from this perspective. I love sex toys, but I'm relatively inexperienced. With the Billy, I was looking for an all purpose anal vibrator, one that I could use alone and with another, one that could satisfy me to the point that I wasn't biting at the bit to buy another anal toy a week (or a month) later. This toy I wanted to hold its own, taking care of my ass to the point that I could not daydream about another toy.
I had some lofty expectations, and I would never say the Billy has been a disappointment. I will say, however, that I have since purchased the Njoy Pure Plug to compliment the Billy. Although the Billy is wonderful for a good many tasks, it doesn't do all that well without a hand moving it or holding it still. So for those times when I just want to slip something in my ass without focusing on the area, I use the plug. So let me admit first off that the Billy cannot do everything (but perhaps only I would be so idealistic)! The Billy certainly excels in most areas, primarily in my opinion when you really just want to focus on the ass. And, really, it deserves the attention; with the Billy lying around, it might just get a little bit of what it deserves.