I've had them on three boats and still have them on my 16 Caro Skiff. I rarely if ever fish timber ...so I cannot answer there.
I have kissed way too many oyster reefs and the tabs have never been in the way there. I have backed out of many places and never had them hang up.
Very heavy weeds might be a problem, but I now fish Southern Wisconsin lakes that are full of lily pads and many other kinds of weeds. Never had any issues. I am, of course, normally working my way forward with my trolling motor when I am in the weeds. I have not noticed any issues and I've had them on various boats for about ten years.
If you run extreme flats..and felt that you had to raise them up to back out of channel.....ST provides a manual cable/cord method of raising the tabs and cleating them off. Not as quick and fancy as Lencos or Bennetts...but they are functional.
I think most guys keep them angled down too far. It doesn't take much tabbing to stop bow rising and the pneumatic lifters smooth out a ride.... big time. Too much angle and you are keeping the bow down with a loss of speed. I picked up speed after I replaced my hydrofoil with tabs. The physics of that feature is interesting and may still be on the ST site.
I love them.However, I do not seem to have a need for them on my present 160W Lowe.
regards, Rich