It can be hard not to turn a question like this into a pug-bashing forum but as you asked for the honest experiences. My close friend has an 8 year old pug and she did all the research in the world, chose a brilliant breeder etc. She got a dog that has an awesome temperament - a real clown but gentle and friendly with it. Very funny. Very willing to please. Loves all people and great with children. Personality-wise this dog is beautiful.
But...
The dog struggles every day with the breathing restrictions and it is desperately sad to see. I know she has said several time she would not have another pug because she finds it so distressing to see an animal she loves so dearly NOT live it's life to any kind of full potential.
It cannot run for more that a few mins without being so out of breath it has to stop.
It cannot go out during the day between June and September because as soon as it gets above about 18 degrees outside the dog cannot cope with the heat.
It barely eats because otherwise it puts on weight so easily and everything else gets worse.
She has had 3 separate eye injuries, one of which cost almost £2000 to fix.
She has to use special wipes on it's face otherwise it gets a horrid smelling and very sore pyoderma in the skin folds.
It snores very badly, which isn't a problem in itself but causes everyone in the house to worry the dog cannot breathe while asleep.
She has teeth problems because they are all crammed up in her short mouth so really hard to keep clean.
She chose a pug because she honestly thought that if she kept it active and healthy then it wouldn't suffer like this . She has found it virtually impossible to do so and likens keeping the dog to 'constantly stopping it from dying' rather than enjoying being alive. It honestly breaks her heart and every time we walks the dogs together she is constantly commenting on all the things my dog can do that hers cannot - and they are simple things like run hard for a ball. The pug can neither run nor carry a ball back because of the way it impacts the breathing.
It is such a shame because if these "brilliant" breeders just gave the dogs a slightly longer nose (like old day pugs used to be) then so many of these problems would go away and the breed would be functional once more. I know there are a few breeders out there doing so now - more power to them.