Anton,
I think there were a lot of issues years ago and the same issues exist with every shock that is designed to be used at a certain ride height and is then slammed a couple of inches below it's optimal setting then you will blow the seals of any shock , whether it be a Koni, pense or any other brand.
What happens is if you lower your car too much with coil-overs that are made for a higher ride height is that you take a shock that has a 4 inch stroke and at normal ride height the shock compresses an inch or 2, at this point the shock has 2 inches either way of travel, now if you were to use a stock size shock on a car you lower 1 or 2 inches , then you end up with a chock that has run out of travel and you will blow the seals as they are not made for that,
If you use a shock that has been built shorter so that when you put the car on the ground it is now already an inch lower than stock, it will still have the 2-3 inches each side of travel so the chance of you blowing your seals is greatly reduced.
In addition, most people if they run a lowered coil-over with a stock spring rate and they lower the car they will also have a problem, we supply high quality Eibach race springs that are in most cases almost double the stock spring rate, so a bump that would normally cause the suspension to compress 1 inch now only causes it to compress 1/2 inch which is what you need with a lowered car, most Moton/Penske/MCS coilover packages have high spring rates on them as well, 500/800 being a common set of spring rates