We have a pump fed septic system in Chatham co. We have a great slope, but because of the number of bedrooms - not bathrooms, we have to have a pump fed system. We have been here five years with no problems. In fact we had an inspection last year with 0" of sludge (she said she had never seen such a good system after five years). My parents have a pump fed system because their tile field is uphill. You may want to find out why they had to install a pump fed system, but I don't think it is a big deal.
Amy