You mine at GHash when the gettin's good and leave when luck is really bad... Bad luck at GHash is felt worst than any other pool.
Yesterday, two block in 17 hours... this would have never been thought of 3 months ago; I left after 7 hours, lucky for me.
The history of them ripping off miners is in this forum alone; I won't go in details but I been victim a few times.
They do, however, pay their mistakes but you hav to be on your guard mining there.
I mine there occasionally and when I need to as I have erratic internet and N clip is quick to load.
However, you'd be better off going into smaller pools and help distribute the hash rate.
Try out BitMinter, EclipseMC, Slush, Eligius and of course, BTC Guild.
The above pools have a proven track record greater than GHash and operators are pretty cool folks.
I currently mine BitMinter because my S4 requires a manual difficulty input; it gives me greater power than any other pool for my S4.
Hope this helps and welcome to the exciting world of mining cryptos
