Garmin Heart rate monitors - your experience?

Hi all, got a bit of cash for Christmas and I am looking at getting a heart rate strap and wondered what your experiences are?

I own a Garmin 945 and I’m keen on doing more heart rate based training so some accuracy would be useful.

The Garmin HRM Run seems older and ideal, and the Pro is newer, lighter and has more features but seems to cost £30-50 more, is it worth it?

Many thanks

Compliments of the season.