How fast do they get their orders shipped? - same or next day
How fast is the shipper's delivery? - same as any good west coast shipper.
How often are their products out-of-stock? - never, unless the site says so.
stock up on Flourish Excel while you are there.
2L for $20 is a steal. I use it to refill my bottle.
and yes, they plastic wrap and tape all liquids.