I had the headwind on my way back from work, but funnily enough didn’t feel any help from a downwind going to. Mine is a sit-up-and-beg type, as my back cannot ride road bikes anymore. Menno’s Kona looks a superb tool.
If you can, try 2 types of assistance: central and back wheel. With the central one you only get assistance (it will go nowhere if you don’t push on the pedals) whereas motorised back wheels can usually go without any effort if you so choose.