It's a great bike.
I bought my Miyata 1000 in the mid-1980s, and for 18 years used it for commuting, running errands, short tours, and multi-week adventures. Over the years I upgraded parts as they wore out. I have since purchased a custom machine, and keep my Miyata as a backup. It is still a pleasure to ride.
If it fits your body, upgrade whatever components need changing, and enjoy this fantastic bike!