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I've been using a power meter for a couple of years but not really 'using' it, I just like the extra strava info. I fucking hate FTP tests though as they're a bugger to do outside, and I can't handle a turbo in the summer, so haven't done one in ages. Thankfully Strava estimates it, and it seems to be creeping up very slowly, it's 30w on last year but I think that may just be from changing power meters... I mostly use mine for pacing on hills, and keeping my spirits up when riding into a headwind (which are constant around the Vale of York).
What little 'training' I do do, however, is made massively easier by having a PM - e.g. 20/40s, Russian steps, over/unders as ^.
I think for me I think I should have stretched (to lessen the chance of cramps) and do more training on endurance at a higher FTP (whatever that will be) to get comfortable to be riding at a painful zone.