As an avid hiker/healthnut, Ive been using this app for the last couple of months and found it helpful and useful. With the new updated, Ive found several pros as well as some cons. PROS: -its faster than the old version -redesigned look (definitely looks better than before) -continued recording of my O2 levels even while my phone is on sleep mode (less drain on my battery life!) CONS: -the recording of my O2 levels will stop if my finger leaves the oximeter and I wont be notified that its no longer recording -past recordings of my O2 levels are clumped together instead of being able to see them individually Overall, its a good update that allows me to continuously record and monitor my O2 levels without overusing my batterys life.