The interface of their site provides great clarity regarding how much hashpower you need in order that your particular block will be found quickly by other miners - very helpful! I've not encountered any downsides thus far from using them as my pool supplier; however they do have some pretty good deals available if one does take advantage (I'm currently taking part). They're definitely worth looking at when considering what pools/miners might work best with an individual project or coin offering going forward. It can also help ensure there aren't too many blocks being solved before yours comes up so it doesn’t mean someone else has already won first prize :) For me personally this was mainly useful because sometimes getting more hashing power than others means certain coins get mined faster, but then again maybe everyone gets equal amounts? If anyone wants clarification about anything please don' hesitate feel.