this is the chat board but...
assuming it is legit, that is a good deal.
it isn't something you want to fuck with.
if it is just powder, then it will take 3 days to feel the full effect.
200mg 12 hours apart is plenty to start
if it is crystal - then be very careful - it hits much faster. 200mg a day is good if you run it long (running past 10 days is nearly impossible in my eyes), and 200mg every 12 hours is good...
people go higher, but if it is your first time - stay very low with it, go slowly
and drink a ton of water