Speed of sync isn't much of a concern to me personally, I don't use Dropbox for big files. Reliability of sync is key for me, and for that I have never had an issue. Everything is everywhere, without exception. No conflicts or corruptions, period.

> Most of us are complaining about services we use for free.

I'll complain about a browser too. "Free" isn't an excuse to offer a crappy product. You're still making money off your userbase somehow.

It's also worth noting that the problems that exist with Dropbox, permiate all tiers. I'll use it, but I'd never pay for a service with so many issues unless I had a very good specific reason. For example, iCloud Sync is way worse but I'll pay for the privilege of being able to dump my iPhone photos online automatically.