Derek,
I just purchased a brand new PP PTE010R in August. I heard that they made noise that may not be tolerable for me. So, I decided to install it outside. I am really glad I did. It is not an OSHA issue, but it would bother me. I have a nice setup for a TV and surround sound (because I am crazy!) so I just did not want to risk it.
I agree with the sizzling bacon comment to describe the sound. The "Thump" right after turn on is to protect your equipment. The PP makes sure you have all three legs producing before connecting power.
PK