I just figured id put my 2 cents in too...lol...
In the past 3 years we have gotten in well over 2k imports, which i know isnt alot comapred to some big rollers... but i think it is enough to have an idea on what to expect..
Odds on getting a morph are, well almost none, that is an already known morph. You will however see cool stripes, black backs, granites , harlequins and other aberant patterns. The odds of finding a het red, cinny, pastel, or any other "not that obvious" morph are like hitting the lottery. Exporters have kingsnake and computers and they know they can get more for cool looking snakes and visable morphs. Years ago your odds were 1k times better. If anything cool comes in they normally get sorted out by the importer and sold for more. This year we got a very high male count, but that isnt always acurate. You will get good looking healthy babies if going through a reliable sorce, plus its kind of like christmas 
As far as "parasite balls" go ... Well where do the parasites come from. Since ball pythons dont nurse on their mothers i have never seen snakes born with parasites. 90% of internal parasites come from the food they eat, and the imports that come in now are all still in first shed or just out of it, and have never eaten, so internal parasties are not an issue with CH, they can be with imported adults or Bush babies however. As far as external parasties mites are not native to africa and you will never see a mite in an imports that has never been in contact with any other animals. Ticks however are common in Africa, but very unlikley on CH since they are hathced in Captivity and not crawling around in the jungle. Out of the 2k or so we have gotten in we have lost a handful, maybe 15 or so. We never have any problems with any parasite internal or external and the babies we get in always thrive. In my opinion there is not much of a difference between CH and CB other then price.
Once again these are my opinions and facts from my past with CH ....
Good luck to everyone that is getting them in. As long as they are set up properly they should thrive...
Just a tip --- Hydrate them right away, soak them all in warm water. Then when you set them up give them damp paper towels so they can shed, thier first sheds can sometimes stick due to shipping stress and dry air.
Kim
N.A.R.C