TR gear is really only feasible if you’re getting very lucky with the random piece lottery, or routinely running 12s and higher. My hunter has 3 pieces of 445 gear with her best trait thanks to the vendor, but that’s because she had two lucky lottery wins and my group is pushing 13s and 14s every week.
If you’re just doing a 10 for the weekly chest, or lower, the vendor might be useful for a fill-in piece if you’re desperate.