The APCO Mayday is a popular budget reserve with many saves to its name.
For those pilots who consider a reserve to be a commodity (all reserved the same) this might be the chute to go for.
It has been tested but to relatively low opening speeds (Compared to the High Energy reserves which are tested to approximately twice the kenetic energy.) For many free flight applications at low speed this may not be relevent. However if one were to consider Free Fall in a streamlined hang gliding harness this chute would need to be deployed very quickly indeed before it exceeded its test opening speed.