Very decent.
I have it both in Philips and in Gaggia.
Excellent value for money.
Update 2022-02-10:
For those who mention that the water tank leaks, you simply put it hastily and you are not sure if it is placed correctly (under the small indicator line), causing it to sit crooked on the flange and lose water.
Also, someone mentioned that this process caused a short circuit, etc. Sorry, but it is very difficult for that to happen, as all electrical parts (except the main ON-OFF switch) are in the upper part of the machine and there is no communication between the water tank area and the ON-OFF switch (I have fixed 2 machines). In fact, the space that houses the water tank has a direct drainage hole that leads the water directly out of the machine, i.e., onto the table it sits on, so it does not come into contact with any electrical parts of the machine.
If, occasionally, it spills coffee around the portafilter, which only happens with the single dose filter and not with the double dose, then the rubber gasket under the single dose filter is not properly placed and the small hole of the gasket does not fit 100% into the small central outlet hole inside the portafilter, resulting in liquid escaping around it and then coming out of the portafilter. This happens to me once a week or with every 15 single coffees, and only if I switch between the single and double dose filters. It never happens with the double dose.
Solution without coffee loss: Test the portafilter+rubber gasket+single dose filter set with plain water before placing coffee in the filter, to see if the water runs around it or from the 2 holes of the portafilter (e.g., by heating the coffee cup you will use at the same time), and if it runs around it, then remove the single dose filter, reposition the rubber gasket (so it will sit in a different position) and then reinsert the single dose filter. 99.99% of the time, it will be fine, otherwise repeat the process.
Solution with partial coffee loss: As soon as the coffee starts flowing and you see it coming out around the portafilter, immediately stop the process, wait for 2-3 seconds for the pressure to release, remove and reposition the rubber gasket and the single dose filter along with the coffee, and restart the coffee flow process. 99.99% of the time, it will be fine, otherwise repeat.
It's a bit annoying to experience the above when you simply want a proper coffee quickly and efficiently, but they do not diminish the overall experience of the machine. Having tried a bunch of other machines in a similar price range, I prefer the above issues of the Viva, which have an easy workaround, over the serious problems of other companies that usually end up with their machines being discarded.