I have purchased several controllers and the TSDZ2 motor from PSWpower. The product ships fairly quick and Paypal adds a comfort zone/ I did have a bad controller, but I had modified the wiring so I couldn't dispute that.

You're buying an inexpensive battery made with chinese cells. My first battery was similar, and actually came from PSWPpower when they were known as elifebike. Mine is a 36V 9AH battery, now 3 years old and working OK. I would prefer their 48V batteries with Samsung or LG cells vs the generic chinese cells. Another $100, but hard to go wrong with the name brand cells. Nonetheless, I have no complaints about my first battery. It was $280 shipped from China. By the way, all lithium batteries bring in some risk of fire and dealing with that is another topic. One reason to buy better grade batteries.

What motor did you have in mind?