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My car is a 2002 Protege 5 with 72000 km on it. Manual tranny. When I took out the stock engine mounts, front was almost torn all the way through and the rear one was starting to tear.
I bought the hardest mounts possible from awr (no particular reason.) Waited 3 weeks for them to come. After the install, I notice rattle here and there, still trying to find all of them. Seems like most of them up came from the front of cabin. The only two vibrating pieces were the trim piece right next to the gas pedal and the Kramer mazda plate bracket. There are other little one but I will eventually find them. The rear mount install were as hard as most said, just time consuming if you are doing it for the first time. I did it a home all by myself in 3 hours the first time (just the rear mount.)
Oh I did try driving the car with just the front mount replace for one day, I notice there are also vibration in the cabin, not harsh but noticible enough to shake up some trim pieces as well. So I really don't mind the extra shakiness of having both mounts.
If you guys or gals want to see how it really feel in the car, come by Centaur subaru I am a sale staff here, I will let you out for a spin.
Honestly, I really like the result even with all the vibrations.