I have used them several times and the service has been excellent.
The last time was an emergency permit approval while I was in flight from Dallas to Mos via JNB. My luggage, including my rifle; was supposed to be checked by Emirates through to Tete but when I arrived at the terminal in Dallas Emirates informed me I would have to claim the rifle at JNB and recheck it to Tete during a less than 4 hour layover. Obviously I did not have a firearms import permit for SA and claiming luggage, obtaining a SA firearms permit, and rechecking the luggage on a 4 hour layover was going to be a problem. As we were pushing back from the gateway in Dallas I reached my outfitters office and asked them to get in contact with Henry to see if they could help. With a combination of the information Henry had from previous trips and the outfitter Henry was waiting for me in the entrance hall with all the paperwork filled out and awaiting my review and signature. 15 minutes later I had my permit and had checked in for my flight to Tete. This is why I use an experienced and trusted import permit service.
Interesting, on the way back my luggage was checked through from Tete to Dallas even though I was spending the night in Jburg.