Had one for 8 years. Great for heating but even better for cooling. One caveat though, finding someone to service it can be a real problem after a couple of years. We have moved from that property, but the place we are in now had one when we moved in. It’s been replaced because the manufacture went out of business and no one had a clue on how to fix it. We are now on natural gas. We did have problems finding someone to maintain our old system too.
Make sure the system you select comes from a company with a long history and good finances.
Having said all this, I still am a fan of ground source heating.