I've had one for a while (I think 2 years).
It's crazy awesome, but not without frustrations.
I made the choice to get the Pantorouter before I purchased a Domino machine. I wanted to make 'real' tenons rather than the floating Domino. I also wanted to have the capability to do other joints like dovetail, box, inlay, etc.
If you have the time to set things up properly it's awesome. I built 40+ feet of deck railing(posts, rails,pickets) all using mortise and tenon created on the Pantorouter. It took time to set up each operation and test/fine tune the fit. Once I had that right I could knock out dozens of pickets with tenons relatively quick.
I also made two end tables out of walnut and a bench out of cherry using the HPR. True mortise and tenon which is 'cool' as a learning woodworker that I could do that relatively easily.
I've also used it for doing box joints on drawers and recently tried out the dovetail template.
Speaking of templates, when I first purchased the unit there were far fewer options - you were making your own if you needed something different. Now, there are a lot more HPR templates and they are better designed. That right there will save a lot of frustration.
Recently, I purchased a Domino 500. I'd been putting it off thinking that it was redundant... I was wrong. The Domino is so much simpler and quicker to use. If I'm joining a couple pieces for say a shelf support - just takes a minute or two for the settings and less than that to cut. The HPR I could do something fancy but it would take me a lot longer to set up.
I've also had frustrations with the table size and clamping odd parts - especially trying to do anything with the table tilted.
I'm probably the worst person to review the HPR because I'm one of the most impatient people. And I don't have a ton of free time to fart around with stuff. When i have a project I want to enjoy it, but I also want to do things efficiently and not waste any extra time. In comes the Domino.
However, I don't think I'll get rid of the HPR. I'm hoping eventually I will have more time that I can set up for those fancy projects and do something more interesting than just sticking two pieces together.
I'd suggest really evaluating what you'd use it for and whether that tool is uniquely equipped to do it or would make it a better experience. You can do most of the same functions like box/dovetail with a router table if you have one. Or inlays with a router and templates.
If you are making furniture and really like true mortise an tenon I don't think you'll find a better option than the HPR.
The build quality is excellent on the HPR and the accessories are so much easier to use now. And the functionality - like depth stop, thickness gauge, etc. are much easier to use now.