I can personally vouch for daily payouts, https://blockchain.info/tx/ee5d3125632d019dc9f45a42161f28977a0bb28f67570954f35455d83cd2add0.   1HizkoF23GwhuiYJBJTY75k448GCvM2tPA 0.03291435 BTC

As for how long it will continue on, that is the ultimate question.  It could go belly up tomorrow, or a year from now.  No one knows, one thing is certain though, the ROI in current terms isn't doable with conventional mining, let alone GPU's.  The only way I could see any sort of ROI like this is if they are extremely good at market trading and know exactly what to mine and when.  In General I would say this is more than likely a HYIP/Ponzi type, if you manage to get to ROI, you should Either try and get the "Refund" and or just let it keep making you Bitcoins and re-invest in something like Genesis or HashNest.  

At any rate, this is a gamble.  If you like the odds, go for it, if you don't like to have the chance of losing what you put in, than avoid it.