EZ Slalom is a great course, Ed is awesome to work with, we have a poly mainline EZ course we install weekly all season and it's held up well (it's about 6-7 years old), with minor maintenance (mostly replacing balls or bungees if the get a handle snag etc) spend the extra money and get the pre gates, well worth it.
When u first install it u will be getting used to it and it will take longer, prob 45min, but after u develop a system we budget 30 min for both install and removal each. 20 min is possible if there's no wind and u know what your doing.
I hope this helps!