For some time I was using Firefox as my primary web browser everywhere - at home and at work, on my netbook and also on my phone via the mobile version. I would often pull open tabs from one device to another via the Sync functionality, and it worked pretty well ... as long as it had synchronised by the time I wanted to pull the tabs around and I hadn't closed the source browser before the sync had finished.
Then my phone started misbehaving, I started a new job where Chrome worked better with the web proxy and the whole system fell apart. I looked briefly at XMarks, which is supposed to have cross-browser tab sync, but I couldn't get that working at all.
So I installed Pushbullet, based mostly on the fact that it was a channel available in IFTTT. Now, even though I'm using Firefox at home, Chrome at work and the stock Android browser on my phone, I can push tabs instantly from one device to any other, as well as send small files to and fro and get weather alerts via IFTTT. It's very handy. It was an adjustment to go from a "pull" mentality to "push", but not bad.
The one feature that doesn't quite work is sending SMS from my desktop - I can send texts just fine, and I know they are received because people respond, but there is no record of them going out at all. Not on my phone, not on the Pushbullet browser plugin. Other people have this problem with the feature and for some of them it works to go out and back in to the messaging app or restart their phones. That hasn't worked for me, but I'm not too concerned. I'm very happy with the other features and I plan to keep using them for some time.
Mokalus of Borg
PS - I'm very happy with the way another machine doesn't have to be online for a push.
PPS - I prefer my multi-machine software to allow that.