We initially bought a cangaroo product that has 300+ reviews (BIG MISTAKE), which after 2 months of average use stopped performing, and there were no replacement heads anywhere, and we constantly had issues. <-- The most important thing here is that it can decrease your production and make you think it's your fault when it's the machine. So avoid it.
We returned it and for 5-10 euros more we bought the Kikka Boo one.
So far (2 months) it hurts less, has stable performance, is more user-friendly as you can hold it with one hand, and it's faster. The biggest plus is that you can find replacement parts (different nozzles, etc.) in well-known baby stores. I just "wish" it had a timer on top.

I wanted a breast pump with a battery, relatively small and without many cables to fit in a drawer, and whenever I need to leave the baby to sterilize it and quickly do my job.

I have already used it 3-4 times and it does its job perfectly. I had an Avent pump for my first son, which cost 120 euros, and when I took it out after 3 years to use it again, the pump was broken and it had to be in a specific position for it to work.

This Kikka Boo pump is amazing compared to Avent. It has many functions and levels, and a very good battery life. With the initial charge, it lasted for 3 pumping sessions of 20 minutes each, so 10 minutes per breast.

After 3-4 uses, the breast was sore, but I also exclusively breastfeed, so it's normal to feel some discomfort.

It is very cheap and does an incredible job. I bought a second one to have simultaneously on both breasts and to have spare parts. It is very user-friendly and does not hurt at all. It massages at the beginning, then pumps, and then massages again to soothe the breast. Compared to the well-known professional one that costs 250 euros, obviously I prefer this one. Obviously, the sound of the pumping is audible.