I snapped my ACL over in Canada and was given a brace very similar to the one that @Stonehedge linked to - effectively hinged metal rods on either side of the knee joined by a neoprene sleeve. Was told by the consultant that her partner always wore his whilst ice skating etc.
Wore the brace for the first few trips for added stability / safety but I don't know how much good it would do in a proper smash - it did seem to help support the knee, so helped conserved knee stability/strength a bit longer, which i guess is the point, I don't think a simple neoprene sleeve would have had the same effect but YMMV. Even with the robocop brace, it certainly did not stop me still being very conservative about what the knee could do - it won't replace proper strength / stabilisation prep (which i'm sure you've been doing).
Just to echo what you just said, I felt it was useful for my first few tentative trips after recovering but now I am fully recovered and leg strength is good after a fair few years of working on knee/leg strength in the gym, I don't feel a need to wear one any more.
Thirded, I found a light hinged brace really useful to start with (a decade or so ago), but on my last skiing trip I lent it to someone who tweaked their knee on day 2 and didn't notice its absence particularly.
I snapped my ACL over in Canada and was given a brace very similar to the one that @Stonehedge linked to - effectively hinged metal rods on either side of the knee joined by a neoprene sleeve. Was told by the consultant that her partner always wore his whilst ice skating etc.
Wore the brace for the first few trips for added stability / safety but I don't know how much good it would do in a proper smash - it did seem to help support the knee, so helped conserved knee stability/strength a bit longer, which i guess is the point, I don't think a simple neoprene sleeve would have had the same effect but YMMV. Even with the robocop brace, it certainly did not stop me still being very conservative about what the knee could do - it won't replace proper strength / stabilisation prep (which i'm sure you've been doing).