Bored, searching on what coil-overs to get for my dying stock suspension.. and ran into a few "brands" that offered pretty much the same product.

D2, Function/Form (F2), K-Sport, Megan Racing, and BC Racing

There isn't much difference between each brand, other than dampening/rebound adjustment and mount material. Also pictures of each product show little difference.

Is there any true difference in quality? or in specs, other than the number of adjustment levels and mount material?

Not only that, but D2, F2, and K-Sport provide the same design for their LCAs
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D2 - Founded 1997
36 Way - Aluminum

F2 - Founded 1999
24 Way - Aluminum

K-Sport - Founded 1997
36 Way - Aluminum

Megan Racing - Founded 2001
32 Way - Aluminum

BC Racing - Founded 1999
32 Way - Iron