My bike came with a Rotor 3D crankset (and circular rings). After a couple hundred miles I picked up a Rotor Qarbon outer and inner ring. It definitely made me a believer in oval!
I couldn't find the left sided Rotor crankarm power meter upgrade for the 3D30 anymore (it was replaced by Vegast) and didn't want to spend $1200 on a Rotor 2INPower. Ended up adding a Power2max NG ECO and love it. It worked perfectly with the cranksets 110BCD, oval rings and reporting is accurate and reliable. There was a slight change in Q factor which required a small tweak to the front derailleur. Aside from that install was straight forward. Thumbs up from me on both Rotor and P2M!