You sure? I have seen some older Logitechs; they don't age well.
Well, all I can comment is on this board in it's pretty new condition. My place of work is full of keyboards, the staff is typing about 25% of the day, all of the keyboards in the place are usually dell or lenovo branded rubber dome boards (except for my keyboards that I bought in myself). The majority of the staff "love" the replacement logitech Deluxe 250 rubber dome board they brought in to replace one of broken keyboards with.
I tried to type on it myself, it springs back pretty decently, but is nowhere as good as my dell At101w, chicony KB5181, brown cherry Cherry MX8100.
But as far as rubber domes go, non-technical and techincal people alike (the staff and myself) think this one works quite well.
It's the least smelly of the ****, let me put it that way.