I have just one and she rules the roost! She's so personable, spits water at me, and does some 'sharking' and zipping around (skimming the top of the water) when she's super stokked to see me (i.e. anytime I walk by the tank and there's a chance she'll be fed).
Ultimately, I concur with the issues with acclimating them in this thread, I tried a couple and they both got fast moving bacterial infections while in QT. I gave up because I don't want to encourage collection of fish that don't fare well in captivity. I gave up, until the LFS made me an offer I couldn't refuse. They offered me a super deal and asked me to come get one that had been in store for a few months. She's been with me for nearly 4 years now.