Buying rentals with cash or mortgage?

[Nicholas Eakin]

I have 8 single family homes that I have purchased cash after I spend whatever amount of time saving with a good deal of success, but feel I am not moving at the pace I would like to achieve my goals. For people in similar situations did/would you continue to save and buy properties cash so you have no mortgages or start taking out loans?

Also, on top of this I manage 30 units for other investors.

Thanks