My biggest problems with Bitcoins is if fluctuation of the price comes.
and then sometimes my transaction is extremely delayed before my confirmation
comes in into my email

If you are trading bitcoin then price fluctuation should not be a problem for you, as I trade bitcoin and I take best advantage of each and every fluctuation to make profits from it.
Agreed. I think that is the problem for most people that they complain the price fluctuation and this really in actual is not a problem. Fluctuation happens because of the buying and asking bids and this is what makes bitcoins special.