The reproductive vet I use states that she is having larger litters and a higher number of pregnancies using TCI. Something about being able to slowly expand the horn and keep it expanded for a longer period using TCI. I believe TCI is the method used in most foreign countries with frozen.

I just had a litter of 9 using frozen semen and TCI.

I just missed my girl using TCI, but before this miss, I had five successful TCI breeding's in a row, with average of 8 pups per litter. I highly recommend TCI.