To make a long story short, this pool was once the 2nd largest pool indeed.

Then, if I recall well it was about mid-October last year, all coins were lost by the pool, they said they were hacked.

A lot of users have lost confidence and never came back. The hashing power on this pool has now become anecdotic and if you are new here I would suggest mining on other, larger pools to start, e.g. BTC Guild is easy to use and you can even use PPS payout if you want coins immediately (I would suggest PPLNS in the long run though). It's generally rude to post this in a pool's thread, but I think these are special circumstances.

As far as I'm concerned, 50BTC refunded me part of my balance and I appreciate their efforts. There are however still many users reporting their balance staying at zero despite mining, so I would use caution. I haven't tried myself yet.