I've had a 1986 Bally Motordome for decades. It's fun. There are many techniques and tricks to get better, detailed in books and online, and when you have a machine at home, as you say, you can play whenever your heart desires and practice. Playing for a long time has a meditative quality, too, and is a good metaphor for life - a mix of skill and random factors.
As others have noted, maintenance is a bit of an issue, though not overwhelming. The machines are beautifully crafted - maintenance can be fun.
As an apprentice electrician decades ago, I remember the first time I viewed the innards/underside of a pinball table/machine: absolute insanity.
Running my own shop a decade later, my favorite way to describe horrific residential electrical panels was "it looks like a drunk pinball machine in there."
As others have noted, maintenance is a bit of an issue, though not overwhelming. The machines are beautifully crafted - maintenance can be fun.