When I purchased my R3T new in '14, I added the 36 month extended warranty for about $1K. Honestly, I never used it. That said, it depends on your financial resources. Back in '16 the hourly rate to work on my bike was $125 per hour (I haven't checked on the rates these days). Assuming it's $150-$175 an hour now, you would burn through your $866 investment in about 6 hours at the shop (not including parts). Personally, I believe it's worth it... with the hope it is a waste of money because nothing ever breaks... but, it does ease one's mind.
-MIG