I too had a Fluid2 and the i710 Polar HRM last year but found it a little boring and was not impressed with the reviews on the Power option on the 710. Elected to sell my Fluid2 and purchased a second hand Computrainer that has the power output you are probably looking for. I can't see needing to upgrade from a Computrainer. It is an outstanding trainer and will satisfy your training requirements for years to come. Garry