GRATS are great, if you can make the gifted stock in the Trusts go way up, the person putting the stock into the Trust, can then take the appreciation in the stock, above a hurdle rate, and bestow that appreciation, Tax Free, to the designated.
If you are not a big fan of the government taxing your desire to gift your family, with the benefit or your Entrepreneurship and sacrifice, this is the vehicle. If the government designates a very low hurdle rate, very low, you could take advantage of it, and easily bestow the stock appreciation to your heirs.
The key, the stock must go up, no matter what, up it must go, and up it surely did, good on you Buck.