My first Bitcoin experience was with Coinbase, and I got burned hard! Disclaimer: *But not necessarily Coinbase's fault*
I decided to buy several Bitcoins last week on Coinbase. After several days of waiting to get verified, putting my order in then waiting for the withdrawal, my money was taken out of my account literally HOURS before the China announcement hit. Since I saw the China report 1 minute after it was released, I logged onto Coinbase to sell my coins really quick, because I knew the value was going to plummet. *figuring I would just buy them again when it started going back up* The kicker? I couldn't, because although Coinbase already took the money out of my bank account, they hadn't actually given me my coins yet. So all I could literally do was sit there sick to my stomach as the price crashed, and I couldn't do anything to protect my money.
Then when it finally stopped crashing at around $500 and started creeping back up, I decided to buy some coins really quick while they were cheap. NOPE. Coinbase wouldn't let me buy any yet because even though they took my money out of my bank account days earlier, the transaction still hadn't finished pending, and you can't buy more coins until your first purchase is finished. So not only did I get screwed by Coinbase because they took my money but gave me no coins, I couldn't even buy more when the market crashed.
In the end, I don't really "blame" Coinbase. I could have tried to get instant verification, I'm just not ready to fork over all that personal info yet. I also obviously understand WHY they have to wait several days for everything, otherwise people would buy Bitcoins, send them away, then go to the bank to reverse their withdrawal. Still sucks though, since I decided to buy Bitcoins at the worst possible time. *hours before a crash* Even if Bitcoins skyrocket in value in the near future, I am still partially bummed because I could have had twice as many.
I heavily recommend to everyone to buy their coins somewhere they can't get them instantly, so you don't get screwed by circumstance like I did.
Are you also on level 1? I imagined a somewhat similar scenario in my head concerning coinbase. Although I'm a bit worried about uploading all my info on the site for instantbuy, I'll try doing that as soon as I hit level 2.