Nxt is an alright line, i would recomened if you are going to use the megs. stuff to go with there more porfesional lines, they work much better and are more cost effective
As for if I use one brand, No i sure dont. No company makes all the products i use, or if on the rare ocasion they do, i dont like all of them. I probley have nore then a dozen diffrent brands in my gargage for diffrent aplications. Heck i even have 5 or 6 soaps for diffrent paints and colours as well as the dirt level. The same applied for waxes, i have one for just about every paint or condition i will ever see. (im prepared). if you are looking at just starting out then find a brand that works for you, however as you start to become more ocd like the rest of us you will find a need for more products and more brands