Needed some parts (heatsink fan adapters) that were better heat-resistant than PLA, so I opted for nylon for the whole bunch (also needed some hinges/adapters for a Pimax VR headset).
Communication with Mark/Seaside 3D was easy and fast.
The prints were shipped in a small cardboard box and wrapped in bubble-wrap. (Our mailman/woman forcefully jammed the box in our mailbox, bending the cardboard box. Thankfully, nothing was damaged due to the good wrapping)
I am very pleased with the end result! Would definitely recommend!