I was quite sore about the shipping issues and I feel strongly that businesses are responsible for shipping and should not think that their job ends before the customer RECEIVES THE PRODUCT. That being said, the SAI is INCREDIBLE, and the DTV4 is quite cool as well. The cheap O-rings on the Sai s my only complaint, and I put the extra. DTV4 spare O-rings and a crushed clapton coil and the thing just RIPS my CBD.