I tried them three times, all bought from the same LFS. From what I recall, they were all around 3", so not as tiny. Only one ever made it past a few months. All were eatting, then just stopped. They also never seamed to put weight on and all were QT'd. When I looked back, all the fish I bought in 2008 were from them and none lived. I've since stop buying fish from them.
What I learned to look for: Make sure they are swimming good, common issue is swim bladder damage during collection, which is fatal. If they appear to be floating up or pointing down, they may have swim bladder damage. Don't buy one that appear to have this issue.
If it's eatting good and swiming good, then it should be good to try. They are pretty fish. I've considered getting another, but my LFS never gets them in. Good luck.