DUST

I'm sure this issue has been addressed many times, but I'm new to the DSLR world

How much of a problem is DUST? I have a friend who has told me it isn't THAT big of a problem unless you are constantly changing lens...I currently have ONE lens and don't see taking it off all that often, but I do plan on buying a lens or two in the near future...

Now I have read some posts on the open forum saying YES it is a problem and NO it isn't a problem...So thought I'd ask my new MINOLTA family their thoughts and experiences with this issue...

Thank You.

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M.
Proud new owner of a KM 5D...1st DSLR