Besides reading the reviews, you could probably pick up a rabbit vibe to experiment with. While there are always vibrators you could categorize as being "good" or "bad", most of the time they please on a case by case basis. Although, because of the extra mechanics involved, even inexpensive rabbits are pricier than others.
The idea is that it's stimulating you internally and externally at the same time, so, since it's a two in one, a "jack" of all trades, if you will, it should theoretically provide mind blowing orgasms. While that is true for many, it isn't for everyone.
The reasons being that rabbits are very anatomy specific and don't vary enough in stimulation. Just because one fits one woman doesn't mean they'll fit them all (especially if they aren't flexible). It's by far one of the most common struggles for buyers seeking to get a rabbit: one that works for them. If it doesn't, no matter what, it's a huge waste of money since they are pricier to begin with. On top of it, there are many who need variation in vibrations and pressure on the clit vs the g-spot while rabbits are more fluid. Often time, women just opt to go with a g-spot vibe with a separate clitoral vibe to use together.
So, really, I would analyze your body's needs, flexibility, and capacity along with the location of your clit to a specific rabbit you are looking for at what you deem is a reasonable price to try it and see if it really is the best for you.