I"m just a patient - you know the one who ultimately pays the bills. Last year I was scripted the e-Cardio ER920W 30 day event monitor. It was easy to use and the e-Cardio staff were great when I did have questions. There was a lot I was just curious about. I was Dx'd w/Atrial fibrillation w/one critical and one serious event reported. This year my cardiologist wants to monitor my response to medication and has scripted the CardioNet MCOT. I had been expecting the e-Cardio monitor again. I was surprised by the size of the box when it arrived and totally intimated by all the paraphenalia in it!!! I"m ready to send it back to CardioNet w/o even removing the contents. Is the MCOT superior in some way to the ER920W??? In what way? The MCOT just arrived this evening and my cardiologist is not available now until Monday to ask WHY he ordered this complicated mess instead of the ER920W.