Excel Combobox (drop down boxes/lists)

I have been using Excel Combobox for my work and find it
an excellent tool to use for complex project. However,
there has been concern within some members of my company
who said that 1) it can't easily track the logic flow
across worksheets 2)it uses macro. As far I am aware, I
have no problem with tracking the logic flow, infact it is
much neater way of showing options than typing 1, 2 for
selecting options, and I did not use macro. This is no
different to clicking on the Tool bar button for bolding
or colouring text.
I would appreciate for your comments/view on the problems
or advantages of using Excel combobox.

Thanks
Lan