I have used the intranasal vaccines for the first time about six weeks ago with my two litter mate kittens. The brand I used was Heska Feline UltraNasal. You can see more information on the vaccine at http://www.heska.com
The intranasal was recommended by the breeder and an internist vet. The breeder said she changed to the intranasal after seeing many reactions both immediately and long term from the injectibles.
Interestingly, the breeder and two other vets were in agreement with me that after the initial vaccines given as kittens, since they will be indoor kitties only, that no further vaccines need to be given. I believe Iím leaning this way and Iíve already stopped the vaccines on my adult cat.