I've spent most of the winter training on a spin bike with a power meter. I'm pretty sure the pm is good, they're kept calibrated and a I know a lot of guys using them say they report similar numbers to their own pms/trainers. I have vector 3s on my bike, and recently also started training on a kickr snap at home. What I've noticed is that at lower power on the kickr snap I'm perfectly happy, but as soon as I get up towards and above FTP the muscular strain is so much higher that I can hardly keep my legs turning over.
I'm planning to retest on the trainer so I have a second number to train with on that, but was wondering whether anyone had had similar experiences, or had any ideas why the apparent strength/muscular strain was so much higher on the turbo.