They've been under a lot of ddos and regular downtime, take one look at their twitter.

Also,

http://bitcoincharts.com/markets/currency/USD.html

look at the volume thats being traded on btc-24 compared to the other major exchanges. If the 100,000 new users is true then one can imagine the imbalance.

Here is my problem is bitcoin-24 cares:

My 100$ liqpay hasnt showed up or responded to after 3 days. (Usually takes 8hours)