Are there benefits to using a lemon squeezer? There are lots of products on the market to ease lemon squeezing. I've never used any of them. 

Are there any benefits to using one? What are some of the advantages and disadvantages of the different types?
I'm a recent convert to the type where you load the fruit between two halves of a metal mold and squeeze. I find that it extracts a very high percentage of the juice with minimal effort and does a good job of separating away the seeds. I find it a lot less messy than the reamer or other type I've owned in the past.