This Karcher (like all of the other Karchers I’ve owned) is robustly made from tough external plastic parts with an extending metal handle. There is a small amount of assembly necessary from the box, but nothing difficult and the only tool that you’ll require is a Philips screwdriver. There are some good improvements to the 2016 model including the better stability and the LED display control handle although to be honest I’m not convinced that the latter is strictly necessary. Overall, this is a good set which includes most of the attachments you’re likely to need for home use. The only extra one that I would suggest for cleaning vehicles is this one Karcher 2.643-147.0 FJ6 Foam Jet Nozzle
which I bought last year and like very much.
As with all powerful pressure washers you need to use some common sense when using it. For example, it is always sensible when cleaning a surface for the first time to use a lower pressure setting and build up if necessary to achieve the best results. Some surfaces won’t cope with sustained high-pressure water jets and through many years of using this kind of tool I have found that it pays to be cautious with them. Having said that, this model is suitable for cleaning all surfaces when used with the appropriate attachments, and in the right way. So far I’ve used it very successfully on two cars, a large sandstone patio including multiple steps, concrete slabbed areas, and even some block-paved driveway although that obviously required extra care to avoid damage.
I like that this version of the K4 stands up and is quite stable in use; even lots of movement including some pulling of the hose hasn’t made this machine fall over. It is a well-equipped set which includes attachments for cleaning all sorts of outdoor surfaces including vehicles. The Vario and Dirtblaster lances are both very good in their own way; the Dirtblaster lives up to its name and produces a rotating jet of water which effectively does what you would do naturally and moves over and around the surface in small areas to loosen dirt. The Vario lance is a more general lance which is used for all other purposes and produces a range of jets from the strongest and most concentrated down to a pressurised mist which is great for wetting surfaces to loosen dirt before washing. It also includes the T350 patio cleaner which is an excellent attachment that I recommend highly (it’s also available separately Karcher T 350 Wide Area Surface Cleaner
if you don’t need the full set). It is perfect for cleaning patios and other hard surface paved areas as it has the advantage of delivering rotating jets of water inside an enclosed area which helps to reduce spray and mess. I first bought an earlier version of this many years ago and can confirm that although this new version is just as effective at cleaning it is also less messy.
There are many versions of the Karcher pressure washers available. The K4 model sits in the middle of the home-use section and is suitable for those who need to achieve decent results on various surfaces, but without spending a fortune. This particular set is particularly aimed at users who want to do most of their pressure-washing on surfaces outside the home, and does a very good job of delivering great results.