Well this is embarrassing... I've just left a reply about how fast this is and how it's nearly my browser of choice.
Straight off, I went to the App store to check if there were any new versions, and to look at the changelog.
No changes since 2014, and worse still, a note from a contributor confirming that Maxthon Browser has been dropped as a Mac app by Maxthon, and will no longer be updated.
Red faced, I back off into the bushes.
Macupdate Moderators action required?