Yes, it's a good install but only with the long belt path.
The problem with the Radian FF in the 3rd row is the front-to-back movement - you can get it rock-solid when you check side-to-side, but if you leave it at that and forget to check front-to-back, you could easily miss it. Checking front-to-back movement is done the same way as side-to-side: one hand, at the belt path, a light tug pulled directly forward. No matter what we've tried, we've been unable to get an install that doesn't result in the Radian's base slipping forward several inches at the lightest tug.
Also, the headrest is required to be on and down for 3rd row installs - it's one of the odd quirks of this vehicle, that the 3rd row headrest rules are different than the 2nd row. For the 2nd row, you route the tether under the headrest, for the 3rd row, you have to route the tether over the headrest. This is because the top part of the 3rd row seat backs isn't reinforced, so the headrest provides that reinforcement. (Don't feel bad - I didn't realize this until someone else pointed it out, too!)