I suppose I'd be more enthused if Firefox syncing had worked from day 1. I've had Firefox as my desktop browser for ten years, and Firefox on my android devices for a couple. My experience was always that the syncing was irregular--i.e. I could have tabs open on my desktop window and see them from across the room, yet they wouldn't show up under the "synced" tabs on my tablet, even after manually triggering a sync on both devices.
So at some point, I stopped relying on that and just installed Pushbullet to bounce stuff around from my desktop to my phone or to my tablet. That has worked flawlessly.
Syncing logins has never really been something I've bothered with. I'm afraid of someone grabbing my tablet and then having access to all of my emails, message boards, payment stores, etc. All of my devices have LastPass installed, which is how I manage that.
So yeah, this would be a bigger deal for me I suppose if I hadn't already found other solutions for Firefox Mobile's old shortcomings.