I usually stick with OEM stuff for customers. The labor is the same, so even with aftermarket parts there is some investment on the customers part. A shop environment is so much different than doing you own work at home, mostly because the clock is ticking and you can't lose sight of things like cleaning and preping the original cylinder. So, unless I know the customer, and unless I know that he's clear in understanding the difference between a full OEM rebuild and taking the AM piston shortcut, my standard approach is OEM P&C or I don't mess with it.
For myself at home, when I'm counting the beers, rather than the labor clock, I've brought a bunch of saws back to life with just a Forester piston and whatever time it takes. So far, my results have been great, and I'm growing comfortable enough to use them selectively in the shop. For those of you who can do your own work, an AM piston is a great way to go.
It's also worth mentioning that complete aftermarket P&C sets often cost the same as just the OEM piston. So, if the original cylinder is questionable, this is an option other than an expensive OEM set. I've also used some of these kits, a few of which are in commercial use for over a year. So far, so good.