Syncing in Group Speed Dial actually better/easier than FVD Speeddial, however FVD has a slightly more polished look and feel.

**I've since ditched FVD Speed dial for this again. The syncing is just that much better. Also I think the icon/thumbnail settings have improved since I last used this add-on. And after a while, and quite a bit of tweaking, the dials look pretty good. I don't miss FVD at all.
Another thing to consider is the Cloud Dials for use on your phone. This loads so much faster than having FVD installed natively on Firefox for Android.