It depends on the source, what their terms are, do they have the financial resources to back you when you really need to grow, is it going to be a short term investment or are they in for the long haul? These are just a few things you must have in writing before accepting any offer of capital. Also you will want to be in control of your own business not the venture capitalist.
Alot will depend on what you are offering and how risky it is, your experience etc for them to even consider your needs.