Anyone who asks me if they should buy just springs, I always ask them to think about how a strut works. Strut handles high speed compression and rebound (sharp, quick changes in road height such as a pot hole or bump). Under full compression in a turn it should still be able to absorb a bump properly, that is how they are engineered. However, running only springs you drop the strut to performing as if it is fully compressed even when you are driving in a straight line. If you hit a bump, you float, because the damper wants to push back to its equilibrium point. Now add compression in a turn and... well IMO it affects the car a lot to hit a bump in the corner.
Shameless plug, I've sold a few sets of all the components needed to move to European Suspension to some customers, one of whom is even in this section. These guys all love it, for cheaper than the price of full coilovers. It's a great compromise since the SQ5 was originally meant to ride significantly lower and does in Europe, but to mean SUV standards in the USA it had to be raised considerably (I believe its over an inch don't quote me though I think its like 35mm). This is a really good option for my customers who don't want to be obnoxiously high but still want OEM rideability. Also, this suspension will last a long time and obviously was engineered by Audi specifically for this chassis and car.
Of course HAS / springs don't come with struts so its way cheaper than buying OEM springs, bump stops, struts, etc. HAS / springs only is a great solution for just looks. But if you drive your car hard, I always have told everyone to look at spring + strut combination kits (often referred to as coilovers). That way the damper is engineered to run at those heights. of course if you go super low on coilovers you will have a similar effect, just nowhere close to as bad. IMO its a safety thing, so i always tell people to get full coilover kits, but everyone is different. Personally, I went with KW V1. Not terribly expensive (Can get discounts at the right time) and height adjustment is huge for me.
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