I just updated a 5 year old netbook running Windows 7 with the free Windows 10 upgrade and I am really pleased with the results.
I always liked this little computer. It was cheap and is less than 3 pounds. It is fairly light to pack and I would not really care if it was lost or stolen. It has a usably sized keyboard. While travelling, I can do work, emails, surf and backup all my photos. Out of the box, it was always a bit slow (single core N450 processor). I had upped the memory to 2 GB and also had to replace the crashed hard drive with an SSD Last year, which provided a small boost. However, using the internet was always just barely tolerable. There was always pauses and stutters. I had to accept these limitations because i did not want to buy a new small computer just for travelling. In 2012, Microsoft Windows 8 effectively made all netbooks obsolete because the netbook display resolution could not handle the new Win 8 requirements.
Windows 10 has given all netbooks a new lease on life. Unlike Win 8, Win 10 can be used with the older display. Everything on my netbook is now quicker. The new Edge browser was a significant improvement over the previous Internet Explorer. I tested out the Chrome browser and found it was even quicker than Edge. It is like getting a new computer.
We have updated 5 computers at home and the office, so far. It takes a while, but there have been no problems.
I will be able to pack my favourite old netbook on my trips for a few more years.