I went on Armour in November 2011. I had previously been on thyroxine for 10 years (dx Hashimoto's in 2001). I ended up on 200 mcg daily.
I started on 60 mg of Armour, while decreasing thyroxine by 25 mcg every week until I had weaned off it completely. I ended up on 300 (5 grains) of Armour by combining 15, 30, 60, 90, and 120 mg pills. I did great for the first six months; I lost a lot of water weight, started losing weight, and had a lot more energy.
In July 2012, I went on 240 and 300 mg pills, and started crashing almost immediately. I asked the pharmacy to go back on the smaller pills, but I have never managed to feel as good on Armour since. On 5 grains of Armour, my FT3 levels were only 2.9 (ref 1.7-3.7).
It has been suggested to me that I got the old Armour the first time around. Those pills expired in December 2012, so is it at all possible that they were manufactured pre-reformulation? I chewed them up and swallowed with a glass of water, but I don't remember the pills tasting sweet or being crunchy.