IS there any ROi with cloud possible ?
Try cloud GH's that charge no more than a 30% maintenance fee (equivalent to 0.12 kWh) and hold on for 365 days and you will ROI. If you want a quick ROI then buy your own hardware.
Not really. You don't have to look far to find people who got ROI after 3 months of cloud mining. But it already happened, and may not happen again

Can you show some math behind this? I cant think of any cloud services that ROI in 3 months is normal.
Right now, many people claim that LTCGear ROI in 2 months. But I won't want to risk my money..
My ROI on cloud mining is 9 months. My ROI from self mining is 3 months.
If you take just the raw numbers the people claiming 2 or 3 months to ROI via the cloud are either baiting you or got lucky in some very unusual way.