I'm 0/4 with LA/DD carpets. Three Haddonis and 1 Gig all came with infections and did not respond to Cipro. I've read they treat their carpets with Cipro but imo not completely. Nem looks good so they ship and infection sets in after arrival but is now resistant to Cipro and quickly declines. They've always been apologetic and refunded me but I don't plan on getting any more from them.
I'm around 75% success rate with carpets from Bluezoo. They have all needed treatment but there nems have never been exposed to meds and generally respond well to Cipro. Don't expect a refund if they melt a week or two after arrival though.
Two Gigs from Ibluewater. Long story, but I strongly advise against paying his premium for nems.
Best bet to for a guaranteed healthy one is to find an established one for sale as Dbraun recommended. Pretty sure there is an established red Haddoni for sale on the classifieds here...