Just returned from our Switzerland/Rick Steves Italy 17 Day trip and here's what I found.
Opted to "gate check" the laptop and camera. I brought along a camera bag and duffel bag (to put the camera bag into) just for them. Turns out they take each item, slip it into bubble wrap holder, seal it with a "luggage tag" and put it into a sealed Turkish Air suitcase. Each suitcase probably had 20-30 items. I watched as the brought 7 heavy suitcases down the jetway stairs (sealed with a cable tie) and loaded them into the cargo hold.
LIFO - Last In First Out (or so I thought)
I was baffled that the airport sign board said "boarding" about 2 hours before our flight. Turns out that that's when they start the gate check process. Turkish Air had to hire about an addition half dozen people to do it.
I used a stripped-down computer rather than my primary one, and felt comfortable with the process (and even more comfortable that I'd encrypted or deleted any personal/private information from the laptop before returning home)
Arriving Home - 3 minutes through customs thanks to Global Entry.
Figured the time consuming step would be picking up the laptop/camera at the baggage carousel. Turkish Air set up a table staffed by two people, was about 6th in line ... and waited and waited and waited for baggage to arrive. I'd guess it took 30 minutes for carousel to start up and 45 minutes for the equipment suitcases to arrive. We'd arrived home, people with connecting flights were starting to hyperventilate. I'm guessing that TSA reviewed the luggage - that's why it took so long.
So LIFO was likely LILO (LAST IN LAST OUT)
Once the equipment arrived, the pickup went quickly - we'd signed for it when we dropped it off, signed when we picked it up.
Overall - a smooth process which took way more time than I'd expected. Get to the departure gate earlier than you might otherwise do so, and plan for an extra 30+ minutes picking up your luggage when you arrive home
Ira Serkes
PS
One suitcase didn't lock so we put two straps around it. The bag arrived with the straps in disarray and no blue TSA notice, so I think someone went shopping in Rome, Istanbul or San Francisco and decided that our heavily used Rick Steves guidebooks weren't worth taking.