Same here. I'm a paying dropbox customer, but I plan to switch in a month before my annual subscription renews. Amazon drive offers more space for only $60 USD a year.

Plus google apps offers more space than dropboxes business plan.

I tried to switch quite many times. Problems are typically: refusal to sync some files, excessive memory and CPU use (last time I tried OneDrive it used ~700MB RAM when storage was nearly empty), no LAN sync (speeds up things considerably when sharing with family/colleagues), no block-level sync (touch a small part of a 300MB file and it gets completely resynced), no Linux client.

No I feel you, I do agree their sync tech is the best. I switched back to Mac so I no longer care about the linux support.

I've really gotten into photography. Shooting in raw means I easily add 10-30 GB of data a week. Just want a cheaper option for more than 1 TB.

rclone plus Amazon Cloud Drive might be an option. They do seem to have no limit when it comes to uploading data, but you can apparently run into soft caps if you try to download it all at once. Apparently Amazon has a lot of spare downstream capacity at their datacenters.

The thing in Dropbox is the syncing. It works very well and it is very fast.

This does not matter for everybody but if you for example work on multiple computers with same files this can be quite handy.

Dropbox has been super stable and is much faster at syncing large files the OneDrive. That in itself makes it worth it for me. Also they're doing some pretty clever stuff with Smart Sync which I'm hoping will get rolled out more in the near future and is likely to be a pretty killer feature.

They were the first big player, they have a lot of brand recognition, and network effects help also.

That being said, it would be interesting to see what marketshare the various players have. I bet Dropbox is 50% or less.