I ordered all 4 because the price was too good to pass on. But I may be selling one of them.....
If the premixes and chapters are good, the Drill Max will be great as an add-on to any other cardio routine, or as warm up before working legs.
Not sure at all about the Boxing series. I realy don't want to have to buy more equipment. But the 4-day split sounds ideal. That's a must.
Clare