Definitely investigate the best machine for your dh BEFORE the sleep center assigns him a DME (durable medical equipment) provider. I was SO glad I did this! I found out that my insurance covered 100%, and what the DME wanted to give me was a base model. Turns out that they get reimbursed the same for nearly every machine. I researched, asked my Dr. about an auto-CPAP, made sure to get a top of the line, quiet machine with a humidifier. In June I had passed the 5 year mark and was able to get a newer machine, and did the same thing. This time I got a heated humidifier, and that is AMAZING. Also, my insurance would pay to purchase the machine rather than rent it. Renting is much more lucrative for the DME, so they often won't offer the option to buy. Even if you have to pay a portion it will likely be way less expensive in the long term. So be sure to do the homework! There IS a 'Disboards' for cpap users that was very helpful.
Also, there IS another kind of mask, called a hybrid. There are only two that I'm aware of. I use the liberty. It's a lot less obstrusive than a full face mask, but since I'm a mouth breather the nasal mask/pillows didn't work well for me.
And give it LOTS of time once he's got it home and is using it. I would say it was about a year before I found it still on in the morning consistently and it no longer bothers me at all. Good luck to him!