Great machine, and quiet! It has power! Personally, I use it to wash doors, windows, and balcony at the cottage!

It does what it promises, powerful, quality construction, for the money I think it could have a few more accessories.

I have stretched it on tiles, courtyards, floors and even during many hours of continuous use. It doesn't hesitate at all. It makes everything new

Excellent washing machine.
The car became like new and the yard and sidewalk were not like that even during their second year of construction.
The only negative is the case for cable wrapping, which is designed for loose storage and not for secure wrapping. Possibly the manufacturer had in mind damages to cables with a different type of wrapping in older models (e.g. tight wrapping) and created this hybrid solution.
The T-Race attachment, which has rotary motion, washes carpets excellently. It should be noted that I also use the other attachments for carpet washing.

Quite powerful for household tasks and relatively quiet. The small size makes transportation and storage a funny matter. Karcher also offers a wide range of accessories and consumables at reasonable prices and with immediate availability.
If someone intends to use it a lot with detergents, it is good to prefer the regular K4 which has a receptacle for the detergent container on the body of the device. The Compact is not particularly practical with the suction hose it has, as there is always the risk of pushing the detergent bottle and spilling it on the ground.

Good evening guys, since yesterday I also have this particular machine in my possession. Well, if you expect a beast to demolish everything in its path, look elsewhere. The machine simply does what it promises. It cleans the yard from greenery or dirty joints, it is almost silent, you can hardly hear it when you hit it with the gun. It seems to be well built, it delivers the promised 130bar, it is small and easy to assemble. Now, I gave it 4 stars instead of 5 for the following reasons. They could have sold it with at least 10 meters of hose instead of 6, so that you can do your job without moving it. The gun, unlike the machine, looks very fake and it is also a shame to pay double the money for a machine that has less power in bar than a €100 one.

Very good machine. I cleaned a cement yard of 200 square meters and a terrace paved with tiles in 3 hours of continuous operation. The machine did not overheat at all as it has a water-cooled motor. Very small in size, which makes it incredibly useful. I would like it to have a slightly longer high-pressure hose as it comes with 6 meters. 10 meters would be ideal, but it's a minor drawback. Highly recommended!

I use it at least once a week at home.
It is not a quiet machine but it doesn't bother me at all.
Very good machine, I have absolutely no complaints.

The K4 is the first in the series to have a liquid-cooled motor. The models below it are air-cooled and have a higher chance of overheating. Overall, very satisfied.

I have tried many washing machines as I use them for cleaning balconies, cars, filters, etc. After researching on skroutz and forums, I ended up with this specific one. One thing I have to say, it is the best thing I could have bought with this money, I highly recommend it!

The most important thing: powerful - high quality, tireless - lasts a long time, without a high price - 2 nozzles, noisy - like all at this price. Water-cooled aluminum motor! If it had a wrapping, it would be perfect...

It is the first pressure machine I bought.
We use it in a small hotel in Paros.

It makes noise when used, but I think we save a lot of money with water conservation, especially when each cubic meter costs EUR 7!

We bought it in May 2016 and used it quite a bit during the summer.

I hope it's okay during the winter and works for the next season too...

If not, I will come back with a new, additional review.
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UPDATE JULY 2019
After 3 years, the machine works like the first day.
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UPDATE JULY 2021
After 5 years, the machine works like the first day with ZERO MAINTENANCE!

FANTASTIC! Honestly, I didn't expect it to be so good, or so durable!

GET IT!