I bought my first Flashforge printer about a year ago (Adventurer 5M Pro). I replaced a nozzle early in its life but apart from a recent issue I had with upgrading the firmware, the machine has performed flawlessly with good quality prints. I sent a request for assistance to Flashforge about the firmware issue. Flashforge returned my email overnight with a solution so the machine was only down for 1/2 a day.
I bought my AD5X and enclosure a few weeks ago. Printing the enclosure on the AD5X and installing it on the machine was straightforward and resulted in an even better machine. The AD5X is quiter with the enclosure on.
I am very please with my Flashforge machines and the service their support staff have provided.
I have had other 3D printers but the Flashforge machines have worked out the best for me as a hobby user