The question should be what do you need them for are you building a competitive racer ?
There are lots of telltale warning signs if you are a PRO racer on the Ksport's and D2's page:
* simultaneous compression and rebound adjustment -- never a good thing
* referring to shocks as "36-way adjustable" when they're really 1-way adjustable with 36 settings
* repeated references to "dampening" (i.e. making things wet) as opposed to "damping" (i.e. controlling forces)
These, along with Tri-Point's dyno test, suggest that the shocks were designed by poseurs, not race engineers.
Also the shocks on a 'dyno'all turn out a diffrent plot, with fairly large difference between the rates on the same settings.
Are they good on the street or weekend warrior? Yes they would be, just be very carefull not to go TO low if the strut bottoms out they are wasted. (~150 usd buys you a new strut)
D2, Ksport, etc etc are all the same generic stuff. They are known to be to stiff or to bouncy
I doubt most of the users know how to properly setup their suspension for the correct damping matched to the spring rate. Theres no such thing as a comfy ride with 9kg springs.
So if you want a less stiff or bouncy ride and you use it mainly on the streets, get a lower spring rate.
In my experience, the vast, vast, vast majority (90%+) of people don't have the slightest clue what they're talking about when it comes to suspension. Most are upgrading from / comparing to worn out OEM shocks and have little to no competition experience "stiffer is better" and "it's pretty and/or cost more than OEM, therefore it must be good" are the prevailing attitudes.
I have them on my track car and the ride is definitely stiff as hell. But better then paying €1400 per strut for now, as im a rookie when it comes to all out racing.
Although dailing them in is a pain.
But for a spirited street car the prize is right!, and no they wont last much more than 50K but then again what 'peformance' strut really does?
OK concluding, they are not by any means a qaulity product like the REAL brands (INTRAX, KW, TEIN, KONI, SPAX etc) BUT for the money they are fine.