Been using this for about a week now and simply love it. Mostly just been using in series unregulated mode. Switching between all modes is very simple. There is two cons with it preventing it from being a 5 star review. First is the potentiometer is very hard to turn. The only way I was able to move mine was by using a pair of tweezers. Second negative would be the battery door is sometime a pain to close up with batteries inside. I still love the device though, and for the low price, I am considering ordering another one.