Maricultures are not scary if you have a thriving population of acros in your tank already. I lose less than 5% and have bought over 20 in the last couple years alone.
I tend to agree with mariculture milles, the losses I had were mostly them.
I've brought home some sad looking pieces from the LFS and they recovered and lived.
My main advice is do not attempt if you aren't having great success with SPS beforehand. I mean, I put them through the ringer before they even make it into my tank. Cut the bases off, 15 min Bayer dip, shake the heck out of them to dislodge pests, 1-2hr potassium dip where they are sliming like crazy the whole time, go immediately from LFS water to half my water, half original water, and they make it every time.
I disagree with the pest statement, I've seen more pests come off dipping frags from other reefers than mariculture colonies... but that has just been my experience. As long as you remove the plug it came in on, there's hardly anything ever on the colony itself. In reality, I see a lot of the acro crabs on the colonies, which I think play a huge part in the lack of pests I see on maricultures.