Been using it for years. Wasn't perfect and still isn't, but it certainly has improved lots.

Main issue at the beginning for me was some sync issues caused by the local apps. Those have been solved.

As for the speed I really couldn't tell you, it seems fine to me, but I

1. Don't really have a super fast connection and

2. Don't upload or download lots so I rarely need the top speed.

Just to say a number uploads for me are around 6MB/s and download around 10MB/s which is my top speed, but I live pretty far from Germany where their infra is located.

For the price I think the service is great, and regardless of price the web client and Linux sync client are some of my favorites. Android app is serviceable but definitely needs work. I don't know if they are still just the two or three guys that they were some time back or if they have expanded since, but development is slow, take that into account, so improvements arrive but take time.

I think my final judgment would be to tell you that since about 2 years ago it's my main cloud. Probably proton would be the only that would replace it, but obviously is more expensive and not really too interested in Linux users, so I don't see that happening soon.

I would recommend you to test drive with a free account, it has the exact same features as paid just with a small amount of storage space.

For me: uploading single file using their client ~25MB/s, downloading ~50MB/s (30-60MB/s). In newer versions of their linux client it's possible to mount filen as network drive or to start webdav/s3 server.

I've been using their service for two years now. It's open source and encrypted, and the upload speeds exponentially improved.

Are all its apps libre software?

It works, but it is pretty slow.

Edit: I don’t use it anymore, after proton added photo upload I switched entirely.

they used to have better file preview. now video bigger than certain size can't previewd.

I am using Filen since 6 months and it's pretty good. I use it as my main cloud backup solution. I am no heavy user. I never thought that it's slow. I was using Mega and Proton Drive in the past. The price of Filen is imho unbeatable and I prefer to support a company that is based in germany.