Are you sure?
No, I just did Adam's numbers in my head real quick and they came out exactly right, which seemed like too much of a coincidence to be one.
I've never used timers, and I doubt I ever will. They're a hackish solution and I've always found the proper solution perfectly workable. Hopefully I'll never find myself in a situation like StevieG where I have no choice.
And before anyone asks me if I'm sure StevieG has no choice, again, no. Both problems he raises with tweening sound like problems I could solve, but I'm sure he knows his physics better than I do, so I'm going to assume he's right.