We are very satisfied with our e4 Premium Adjustable Base - Split Top Flex-Head. Very Comfortable and adjusts very smoothly.
I bought this Zero Gravity bed for my husband who absolutely loves it. The only little annoyance is that you have to lower the bed in the middle to get out of it during the night. Otherwise, it's perfect.
Ordered 2xl twins Zero Clearance frames and 2 mattresses. Sleep Sleep Sleep! Will be buying another set soon!