Dashlane user here too.
The iOS side of things is great but if you're a Windows user then I have a few grumbles. Quite often the automatic filling in of passwords will stop. No idea why but leave things along for a little while and it'll start again. That's without restarting anything, including my web browser. I don't remember this happening on my Macbook Pro.
It'd be good if you could set your own default password settings. Unless you change it it'll want to use 12 character passwords but I prefer to use 20 character passwords. There's no way of telling it to default to 20 character which is a bit of a pain.