Looking into getting these as I've seen they are highly regarded on this forum & the ft86club forums, but I have yet to see any one explain what exactly makes them so much better than a cheaper set like a Tein Flex Z.
I know a big plus is they are rebuildable, but what else makes them great?...Quality? Durability? Ride? The way they are valved?
Basically why should I buy these over a different/cheaper set?
Use: daily driver, weekend autocross
The points you stated above. But also, they are made by KW, so you are getting a premium product at a really good price, they are stainless steel so they wont rust like most other coilovers, they are TUV compliant (german highway regulation for modifications) so they are made to a gov standard to comply with.
There product support is fantastic, I ordered a set of the Tarmac 2's and when I went to install I was missing a set screw on one of the collars, they had me a new collar out within 3 days with the new screw. The collar original collar was actually stripped and the new one happened to be different (didn't matter as I only needed the screw then) I reached out again and asked for the part number as it was my fault I stripped the screw, they sent me out another collar no questions asked, even though I clearly stated I made the error.
I was also bouncing questions off Myles at their product support center the whole time prepping for install, he even gave me his cell number in case I ran into issues installing over the weekend.
The service alone is enough for me to go back and buy from them in the future, also they are KW based coils so they ride amazing and perform just as well.