All of my structured training happens indoors, so I use a Wahoo Kickr as my power meter (it's nice not to have to think about intervals... just suffer). I had one on my last bike, and after the insurance company gave me money in exchange for that damaged piece, I haven't picked up a new one. I'm still unsure about getting another on-bike meter, since riding without again has been liberating. After all the suffering indoors, I'm liking the outdoors to be just for the enjoyment of the ride.