I can't speak for PT as far as providing PT180 owners, but I can testify as to my own PT180.
Overall, I have been pleased with it. I have had a few minor problems that I have posted in detail about previously, but here is a short synapse:
In the heat of the summer, I found hydrolic oil overheated within a couple of hours of mowing. I plan to have an oil cooler added that should help. In the meantime, I have taken to bringing a water mister with me and spraying the hydrolic pump every few minutes. That helps, too.
I had a flat. That seems to be a risk of most PT models. The cause was a second air valve on the inside of the rim that got brushed off by grass clippings piled up. You can replace this with a plug.
Lastly, I would really like a minihoe! Someday, I'll probably upgrad machines.
The good:
4wd in a machine of this size is almost impossible to find anywhere else.
There are over 40 attachments available through PT. If you are so inclined, other brand attachments may be easily adapted to the machine.
I've been able to do all of the maintance myself, so far. I work in the healthcare field, so I am not exactly mechanically inclined.
The size and articulated steering make it very manuverable....
I'll be happy to answer any specific questions. In summary, I'm very happy with my machine.