I've tried a couple of NAD at home epi pen solutions, but the DIYNAD+ was the cheapest, so I switched hoping to save a few quid.
However I found the product to be inferior to others I've tried. (1) and most importantly I didn't get the same boost feeling, as I did with others. (2) when injecting it, it triggered a painful almost burning feeling in the injection area, which again I had no experienced with other solutions.