I have had one for the last 4 years and I give it 5 stars.
By far the best charger on the market.
LCD displays charge current, total kwhr charged per session, lifetime consumption. One can change scheduling, current limit, and many other things.
The engineer behind OpenEVSE open-sourced the source code for his product.
I've purchased a few of these units and haven't seen anything related to a discount code being available. If this is there, I apparently need to pay a little closer attention to e-mails that I receive.