Did anyone try GreycellPMP

Did anyone try greycell PMP app in Android\Windows Phone. 

One of my friend told about to buy this, would like to know if anyone had used it.





Oh ! Sorry looks like this is a free app. So far this is an awesome resource to practise on the go !!! 



Advertising comes in all shapes and colors, 


it's odd that you and the app developers shares the same name! hehehehehehe