NOT a Kiko expert. On the other hand, having bred top-quality Boers for so many years and somehow staying abreast of most things "goat" have gleaned a few things about Kikos:
1) Yes, they are supposed to need fewer feet trimmings than Boers. However, that is affected by both terrain and feed. Since there are so few Kikos in the USA it is difficult to make sweeping statements like this. BTW, I find this one tough to swallow, as Kikos trace back to Saanens, who need more regular foot trimming
2) Ditto on worm/parasite resistance. Our Boers are routinely wormed just twice a year. Good herd management and knowledge of the correct wormers to use makes a big difference in your success in this area. You have to realize that some folks/goat raisers/breeders don't want to do any extra work - and they are willing to accept lower weight gains on kids as well as higher mortality rates or lower numbers of kids born. On a spread sheet, a breeder may decide that having few or no extra inputs makes the numbers work out, even with higher losses - all depends on what a breeder/raiser considers acceptable.
3) This is from both Kiko and Kiko/Boer breeders: Kikos do not have as high of a meat to bone ratio as Boers do - even Boer/dairy crosses (75% and up) show better growth rates and better ratios
4) Last but certainly not least - with such a small gene pool of Kikos - unfortunately it is tough to find clean Kiko herds - most have CL. Extensive conversations with a gal who was doing Boer/Kiko crosses (by the way she loved the crosses!) - she had a very hard time finding a clean herd with good genetics. She eventually did, but had to pay a much higher premium to get what she wanted than if she has just gone with all Boer.
So have your friend meticulously check on CAE/CL status for sure.
If the price is HIGH, you have to ask yourself - how much do I gain with Kiko? 2% better with parasites? You can always use #s to skew the facts. Not saying this breeder is doing that, just remember waaaaaay back reading a study of 100% Boer vs. Boer/Dairy cross kids - the Boer/Dairy cross were 75%. The study ( on like 100 goats) showed that Boer/Dairy crosses had a higher Average Daily gain. So suddenly everyone wanted the crosses- but if you read the study, the difference was 2/10ths to 3/10ths better on the scales. Not a substantial difference, but the statement "The crosses show better gains" was technically accurate.
Finally, Kikos are supposed to do better than Boers in the humid South... Everywhere else, it is pretty much a wash, and of course genetics and common sense management make a big difference.
My 47 cents....

(Keep the change! LOL)