Group,

Here's an update from my account in regards to the issue of ROI.  Below is my first contract, merged along with several reinvestments during March, with CM, so you can see that after roughly 90 days I have almost reached ROI.

15-03-2015 22:23   1086 GH/s    1.066 BTC    0.94337385 BTC

Of course each contract and situation is different, but if you are considering a purchase the above gives you an idea of when you'll hit ROI.
Overall, I am at about 62% ROI on all my contracts which now total about 3 TH/s.

Michael
Moncton, NB