I agree that you've done a good job in finding a value tent. One third the price of a Big Agnes does make sense. My concern would be the quality of the poles, zippers, seam seals, and the longevity that you can expect from them. I did see that there is a lifetime warranty so that may cover it. Even with that, a collapsing and leaking tent is no fun.
To be fair it does weigh more than a few ounces more than a Big Agnes. More like a pound plus.
One other point: Ortliebs last forever are worth every penny.