Although £799 seems like a lot of money for a left-hand crank, Stages is the cheapest way to get an accurate read on the effort you're expelling.
Set-up is stunningly simple and use is the same.
Thanks to temperature calibration happening every two minutes, once set up you should expect accurate and repeatable readings, which is just what I got.
Being a crank-based system, it's possible to compare data and while I found the Stages read 20 watts higher it closely mirrored the other power meter I compared it with.
It's early days but so far Stages is a brilliant, accurate system with no downsides and what's more it only adds ?20 grams.