I ran the FJ coils and billies for over a year / 25k miles. Couple observations from my experience:
- They do not offer 2.5" of lift. Here's why: most of the lift in any lift setup is from coil strength and while the FJ coils are stiffer than the stock 4R coils, they are still soft. Which means, they will not provide the full lift. It would depend on each vehicle and what weight you are carrying, but in my setup, I got at the most 1" out of them (I do have a lot of extra weight).
- The photo posted above does not look like a full 2.5" lift to me. 255x75x17 is a 32.5 inch tire, and with a 32.5 inch tire and 2.5 inch lift, you should see more wheel well gap than that. Unless folks can show actual measurements of before and after, I highly doubt the FJ coils provide that much lift.
- The FJ coils do offer a fantastic ride quality. I LOVED the ride - not too soft, not too firm.
In general, the FJ coil route is a "cost effective, better than stock height" option, but not really a legitimate 'lift' option. Hope this helps, there is an entire thread stickied on FJ coils that has a lot of great info.