I've also found about a 10-point discrepancy. There's a huge difference between 15% and 25% bf.. one is approaching athletic while the other is obese.

DXA is definitely less convenient, but there's no real reason to test your bf% daily (just like weighing yourself daily isn't productive, you need to look at average changes over time). Considering the amount of time it takes to significantly change your bf%, twice a year testing would be plenty.. and would probably cost you the same amount as this subscription service.