I know one, Peter, who has made this exact switch, and my take on this is, based on what I see when we ride, and have ridden it myself (but not the low AR one):
No they are not more difficult to ride, but you need a tad more speed in jibes of course, but not much difference really, compared to other foil brands.
They are faster yes, I wont call it a different league, but you are not in doubt.
Low end almost the same, but require you have technique to get up foiling so the apparent wind and lift kicks in more than on the low aspect wing.
I dont know what you mean by mid aspect tail wing (stabiliser), but if it is smaller then yes, it can be used with the low aspect wing and it will be more lively in general and in turns - this can be a benefit but also a disadvantage if you prefer stability over livelyness
Here he is out in the spring with the Happy Foil (when water was cold) an awesome day, wind around 11 knots