The 705 models are not necessary to buy; the performance differences are not significant enough for most users to notice, and they can't really tell the difference.
In terms of performance, the older versions of the "Old Eight" are generally slightly better than those from other brands within the same price range. Other aspects are a matter of personal preference. As some users on the forum mentioned: "Just like naval and land forces, you'll naturally favor one over the other."
However, the Wires-X in version 1F still only offers futures functionality, and I particularly dislike this feature.😡