What are the peak ages for your kids on the Learning Tower?

[ourbabygirl]

I remember DD started using the LT around 15 months or so... she had just started walking and would stand in it (next to me, with supervision, of course) to cook or decorate Easter eggs or something.
DS is 14 months and has been walking for a while, but I'm not sure he'll have the patience to stand still on the LT... is it something that you've found depends more on your kids' age or personality? Also, have you been able to have both of your kids on it at the same time?
DD (a little over 3) actually seems to have a little less patience on it now but maybe she'll be more into it in a year or two when she can help more in cooking, decorating cookies, etc.? Just wondering if I should keep it or get rid of it now...