Pro's of a Round Trampoline:
Rebound toward center: The round trampoline rebounds towards the center, which causes each spring to stretch evenly.
Light weight: It is lightweight and easy to ship compared to the conventional models and therefor easier to assemble or even transport to a different location.
Fair price: It is priced fairly since it requires less steel in its construction. Its entire frame absorbs the force from the jump evenly, therefore less steel is required for a sturdy construction.