I have them in a T3'11 as well. My first impression was that they were exactly like the Xray ones. Seemed to be very well put together and of great quality.
On the bench they were exactly what the doctor ordered as they reduced the wheel hop/grinding to nil.
On the track they lasted about 3 minutes of a 4 minute heat. I was pretty disappointed. I gathered up the bits and near as I can tell a pin sheered on a hard wall hit (not the first hit as I do tend to smack the wall a bit). I contacted arrowmax and was in touch with their customer service department. I sent some pics of the parts and they determined them to be faulty and sent me a new set.
When I compared the new set to the old they were exactly the same but I did find that the original ones failed cause the grub screw backed out and the pin came out, not a sheer as I thought.
I put some xray ECS pins in the old ones as they are the same dimensions and put them back on the car. Happy to report that they held up to my beating the snot out of them.
Time will tell how they hold up but so far I am impressed. I would recommend them to anyone looking for a cheaper alternative to the xray shafts as long as you rebuild them before throwing them on the car.
Order some extra pins while you are at it. They work for me.
Better than Randy, Adam said so!
Second thought...I don't trust Adams, they make up everything!
"Leave it to Steever", custom paint masks, decals, and paint.