I just had my free introductory class on Tuesday I really enjoyed it . I plan on going back in Saturday to join . Like you , I was initially disappointed about having to buy another HRM since I already have one . Thankfully their devices aren ' t proprietary they ' re just branded with the ID handyvisible for the staff . Both options wrist and chest are ANT Bluetooth standard that will work with apps and devices outside the OTF studio . I was initially upset about not using my own Wahoo TICKR chest monitor , until I realized that the cost hassle of trying to support outside devices would add overall cost and diminish the seamless experience OTF provides . I tried their chest pod for free , worked fine . I ' ll try the wrist on Saturday and then decide which to get . Lots of posts on here comparing the two . Black Friday promotions will start on Friday and run through Dec 31 . The rates are close to founders discounts at least that ' s what they ' re running here in Dallas .