I'm a big fan of shrimp, I wasnt sure I would like them, but I love the little fella's, so much so that I am going to set up a breeding tank for my son.
They add lots of interest to the tank, they bomb around the place, turn over the sand, pick up the left overs & are just very cute, inexpensive, colourful, easy care little critters, highly recommend them.
As someone else has already said they are sensitive to water conditions, so you need to have a fully cycled tank & keep up with the water changes to keep them healthy. Oh & no copper based meds, they are sensitive to copper.