I've known a couple of people that have owned them,and have looked into getting one myself.
I do want to get one eventually, but it's a big commitment and a lot of work.
There are some things to remember and do before you can get one:
They are big, 45+lbs., this means that when they are little psycho kittens that like to jump and grab onto you and tear around the house at a million miles an hour they are 10+lbs., the size of a regular grown housecat.
They have to have outdoor area, preferrably a minimum of a 20'x20' habitat, with access inside and outside. They can jump 10' straight up, so it has to be fully enclosed. They also like the water and will be perfectly happy to go run around outside in the rain and play in the mud and then track it all in. Be warned.
Servals form a strong bond with their first owners, and while they can adapt to a new family, they are never really happy again. You need to be committed to taking care of one for 20 years or so. This means that the cat needs to be like having a kid, and you should take them into consideration before moving or any kind of big moves. Also, they aren't good to have around children under 4-5 years old. They aren't intentionally harmful to them, but they just see something that size as something to play with and they can be unintentionally rough. This is something to consider, you don't want to push your Serval out just becuase you want to have a baby. On the other hand, if you already have bigger kids and aren't having anymore they are fine with kids for the most part, as long as your kids treat them with respect. If they pull it's tail and it swats them, it's going to have a bit more punch behind it than a housecat.
If you decide to seriously consider getting one, you should do at least 6 months of research, 6 months of making your place ready for them, building the habitat, etc. and then go visit a few breeders and spend some time with the parent cats. The breeders should be interviewing you a lot more than you interviewing them, because they know more about the cats. If you go to 3 breeders and one will sell you a cat, and one won't, you should strive to find out why that breeder won't sell you a cat and try to fix it. Breeders that are very protective and selective about who gets their cats usually really love their cats and know what they are doing, so you'll be much more likely to get a very good one.