Ordered mine last week and got them installed yesterday, it took a trusted local performance garage two hours to install. but it looks like I might need a
wheel alignment (1-2 degree slight pull to the left).
I have put 75 miles or so and I agree with everyone, that this mod provides a remarkable transformation. Even the Mrs. loves how the car "hugs the road" now and she insists that a set for her 4.6 2009 Geni is in order (I guess she would have to wait for her birthday

).
Here are my impressions so far, the car now;
- Glides over any road imperfections
- Big pot holes does not transfer to the
wheel / body.
- Cornering is much more stable in the new configuration.
- While testing hard breaking, ABS is far less intrusive.
- And here is the best part, hard acceleration the ESC intrusion is almost none existent!

- I was not able to recreate the left turn 'dead pedal' issue despite me trying very hard to do so.
All this on the crappy stock Conti tires!
I have driven the 2015 3.8 Ultimate, the 5.0 and the 5.0 Ultimate (in all three suspension modes) and in my option this mod stabilizes the R-Spec to somewhere between the 3.8 and 5.0 except the R-Spec is slightly more spirited than both of the 2015 flavors (to be expected due to being 400+ lb lighter

)...
Highly recommend this mod to anyone who suffers from a poor ride quality and or would like to address some of the ESC deficiencies found on the G1 Geni.