Because PEX fittings are inside the tubing, it cuts down your inner diameter, and I've occasionally experienced some 2nd and 3rd floor water pressure irregularities.Every time I run into an issue with a supply pipe, some of all of it is replaced with PEX.

It's no picnic coming home from your day job and dealing with a tenant who called to say that the water heater is leaking and soaking the ceiling of the unit below but the benefits far exceed these occasional headaches.

Having people there occasionally in my opinion is safer than leaving it empty also.

Occasionally a well will have issues, the pump will go bad, a check valve down in the well will go bad, there's also a pressure system set up, here it's in the basement of the home usually, that can fail or hiccup on occasion as well.

I did most of the work myself employing helpers only occasionally.

An occasional incidental sale of property is Ok, but you need to appear to be a passive buy & hold investor.

This is a manageable drive to make occasionally visits to check up on your properties and keep the PM honest.

Around here new developments often require a run-off pit to catch and temporarily hold the rain from our occasional cloudbursts.

Occasionally there is some fluctuation, but I rarely find it difficult to find good tenants other than a seasonal issue around the Thanksgiving/Christmas holidays.

The area around Brown University would be an exception to that, but unfortunately it wasn't worth maintaining an infrastructure to support an occasional deal.