They can be quite addicting and they are such a cool colony fish behavior wise They are quite manic. A nice group of Ikola, Moops, or Bulu Points look amazing. Dubs are nice and probably the easiest to start out with. Although they can be prone to bloat...it is easily mitigated by not overfeeding, feeding consistently, pwc's--consistent water chemistry, and removing hyper-aggressive males.
Most of my Tropheus deaths were just from 1 or 2 Jerk fish and their reign of terror on the tank. I feel aggression is probably the biggest contributor to tank casualties and many start dosing with Metro/Clout like crazy when it is really a hyper-aggressive fish picking fish off one by one rather than the actual parasite; however, I have had an experience where I lost multiple fish one-by-one from bloat as well. I have fewer casualties when I used very little rock-work and only kept my light on for no more than 4 hours a day.
They can be quite the obsession....i had to take a break and go with a predator hap tank for once. Wow Frontosas are another thing, but kind of 180 degree from Tropheus...and I have yet to dive into Petros...but my friends have and man...they get expensive and they are like Tropheus on steroids...aggressive wise.