They are cool but are not a long lived star. From what I have read if you can get one to last over a year you are doing well, they say most die around 18 months. No one is 100% sure what they eat so they usually end up dieing from starvation.
If you touch them with your hands the oils from you skin can kill them, they will develope a white spot and it spreads. They look like there melting.
I have had a maroon, orange and blue and the blue lasted around 2 years before it died.
The maroon was dead in a few weeks, listened to LFS
and added it to a new tank. The orange died from my tank crash.
So if your tank is mature 12+ months with lots of LR
they are worth a shot. IMO
having a very mature tank is a must...