I'm on my 2nd Keystone Camper and of my 3 campers, they keep getting bigger and bigger. By far, the Outback is the best we've had. Manufactured by Keystone, it's well built not had any problems, except for those I've brought on myself.
Previous camper was a Keystone Springdale. We had A-Frame failure, which Keystone fixed 100% no cost to us and then it turned out to be a really, really, really good trailer. We traded because the floor plan no longer worked for us (and it had no slides). FYI, the frames used on Keystone changed after that too. We noticed the tongues got heavier and more solid in later models.
I've seen the "Premiers" at my local dealership and they seem OK to me.