We purchased custom Milette doors through a hardware store with the intention of hanging them ourselves.
Not only were the doors 4 weeks late but they were not made correctly. It wasn't even as though there were large obvious errors. No, my husband and I spent 3 hours trying to hang one of the doors only to find out there was a small error with the hinges and the door stop which made is impossible to hang the door correctly.
The problem was that we had other installations (baseboards and floors) that were dependent on the doors being installed. My husband (who is quite the handy man) figured out a work around, but for the amount we paid for custom doors, this was just unacceptable.
Also, in the meantime, one of the door frames had split. We followed the instructions of staining and sealing within a week but the top frame was split.
We went back to the hardware store but had to deal directly with Milette from then on out. One of their local reps came out to our place to see the issues. Eventually (i.e. 5 weeks later) they had someone come out to fix the door frame.
He did a great job, I am very glad that they didn't charge us extra, but I did have to spend time retaining and sealing the portion that he replaced.