i love mine especially on big patio doors .on outside windows i wash with water with a squirt of washing up liquid and white vinegar rinse with the hose then vacuum off ,lovely and clean and streak free x
I have one, I use it for condensation on the bedroom windows in the mornings, and also the bathroom window and mirror after showers. Absolutely wonderful machine.
So-so. It works but doubt it's worth it. Bucket of soapy water and squeegee works fine. It doesn't need vacuuming dry afterwards if you do it properly.
I've got one but seldom use it because I find that you have to move it very slowly down the windows to enable the Vac to suck the water up.
Another problem is when you get near to the bottom of the window the window sill ledge stops it reaching the bottom of the glass, you have to do that side ways along the bottom. You also have to keep the rubber squeegee on the Vac free from fluff and debris to stop it streaking.
I bought one and was quite pleased with the first couple of uses.
Subsequently, I’ve gone back to my trusty little 99p silicone blade and a wet cloth. It’s quicker, easier and gets a better result.
Bit pointless for interior windows - who uses loads of soapy water on inside windows? More useful if you do your outside glass yourself.
A friend uses it to clear streaming condensation on the inside of her shop windows after very cold nights - quick and efficient.
Don't forget that other makes are available at much reduced cost....eg