I have shot with Manners but I own McMillan. It just fit me and felt better. When I ordered it, I was originally going to order the A4, but the lady I talked to at McMillan (don't recall a name as that was 5 years ago), talked me into an A5 and I'm glad she did. That being said, I wish they did a folder like Manners. I love my A5, but because I'm running a 300 wm with an adjustable cheek piece, dropping the cheek piece whenever I need to remove the bolt sucks, simply because of the inconvenience. I'm now looking at a Manners TF4-A for it so that pulling the bolt will be "easier". But even if I get a Manners, the McMillan will just sit in my safe as a backup, or maybe a second stock for my hunting rifle.
If you do order a McMillan, go with the KMW Loggerhead cheek piece, as just about every offering from McMillan seems to come loose after strings of fire.