Have been there a few times to have the Temple Ball. I didn't think it was as special as everyone promised it would be, but it still delivers a pleasant, clear high so would occasionally get a gram.
Went there last August to celebrate getting a tattoo, treated myself to 5g of the Silver Haze on the dealer's recommendation. It was the strongest weed I've ever had in my life (and quite distinct from the Super Silver Hazes that are around) - got so high from a small pure spliff that I was twitching and laughing hysterically. Some friends were teasing me about being a lightweight, but when they tried it they were all floored by it as well. These were all people who live in Amsterdam/work in a coffeeshop/smoke everyday.