I will try to use as few words as possible to describe an experience which I found appalling from this vendor. I purchased a SRM Origin Carbon crankset on Oct. 19th via Ebay, advised them on the 22nd that the unit was giving 15% more power than it should (I compared it to other unit I own performing simultaneous measurements with a trainer for example). No question about the unit being defective (I am a CTO in a high-tech company... I know my stuff). We jointly agreed to send the unit back to SRM for verification. It came back 5 weeks later... with the same problem verified by simultaneous comparison with Saris H3 (trainer) and Favero Assioma Duo (pedals), still 15% too high. They then REFUSED to take the unit back and reimburse me claiming I had passed the Ebay 30 day return period... I had to get SRM directly involved for him to accept to refund but while I sent him the unit the first week of December, I got the money back on December 28th after a Paypal refund request was closed. Read the return policy carefully: "the item has not been installed or used and all packaging including accessories, boxes and manuals are returned to us in the exact same condition as when shipped to you" means if you try your powermeter and find it defective you are on your own... That's a "hell" of a return policy! Furthermore their "damage item" policy states: "...Please contact us so we can assist in the repair or replacement of your item...." That was absolutely not the case for me. Power Meter City bluntly refused to replace or assist in the repair of this powermeter... it was never repaired. I also place a harsh judgement on the quality control and the engineering at SRM. To let a unit out in the field at 15% off the mark on a specification at +/-2% is totally unacceptable and places huge question marks on all their Origin or other crankset production in my regard. Again, I know my stuff high-tech and quality is what I do for a living. This crankset was nowhere close to anything I expected so far off it was unbelievable... So I turned around and bought something else form someone else... I fully expect Power Meter City to reply to this very negative reply in some way, possibly trying to look good as a result. Do not be fooled.