Cadence work is off by 2x about 50% of time – Motosumo Review

Not reliable. IOS 11.2 on iPhone 5S. Cadence alternates keeps alternating, sometime correct sometimes half or double of actual cadence. Wild fluctuations are distraction in spin class. Sometimes group is displayed and sometimes not. I use a rigid bike mount I use on my road bike. Other spin class participants use a rubber band type mount. Not working well for anyone in class.
Review by leebeau on Motosumo.