Hi Dave.
There are a few of us using the RX10iv on here and I think it's fair to say we're all generally very happy with it - I'm not aware of any issues that crop up frequently and I don't recall much being mentioned on here either. Mine has been 100% reliable.
As a walkabout/hiking camera I think it's unbeatable - you can get a decent landscape shot at 24mm then if you see a bird a few seconds later you can get a good wildlife shot at 600mm. Not much competes with that!
A couple of samples:
Beinn Alligin by
Mike Smith, on Flickr
(if you're interested, click through to Flickr and zoom in to see the fine detail)
Robin Portrait by
Mike Smith, on Flickr
The main downside is low light performance - being a small sensor you are going to get more noise and I almost never shoot above iso1600 and normally try to keep it to iso800 if possible. I use Topaz Denoise to reduce noise and sharpen - it's not super expensive and should plug in to PSE. You don't
need this as such but I would recommend it