My honest advise, the Vector pedals have been designed for road use and as already pointed out, if someone were to ever take their road pedals off road the brand / distributor has every right to turn down a warranty sighting the product was used outside the scope in which it had been designed. Further to this, i strongly believe that any brand that brings a MTB pedal based power meter to market is going to have major reliability / durability and accuracy problems. I would never put my own money behind a pedal based MTB power meter. Some immediate issues that come to mind are - serviceability, good quality mtb pedals can last 18 months before a service is required. expect to half this for a MTB pedal based platform as the brand establishes what bearings work and which don't. accuracy, the conditions a MTB operates within is far more aggressive than that of road, this means the algorithm used in the measurement of power on pedal based system for MTB will have to be significantly "smoothed out". Not to mention the ranges of cadence used in MTB are also different to that of road. when i look at power meters it comes down to accuracy and reliability / durability, a pedal based mtb power meter has major question marks. Regardless of the above, i do believe pedal based power meters for MTB's are on their way. SRM introduced their version at EuroBike and i am sure more will be launched this year. Right now the power2max (crank based) platform are incredibly popular given their pricing point, dual sided power measurement and that good old Germany engineering and manufacturing quality meaning the customer has reliable power data.