I've used both (assuming the N Joy and the 4072 are 801s) I think both are good but prefer the M201. I ordered the 201's from freshsmoking.com where it is called the Emperor. I've got the pretty red one with the flower graphics and the black and grey swirling smoke graphics one. I also had a problem with one of my batteries but it was no big deal as I had ordered a number of replacements. Freshsmoking shipped it priority mail the same day and I got it 2 days later. Important to note that 801 batteries do NOT work with this model and if you use the wrong battery or cartridge you will suck till your cheeks ache without getting any vapor. (Both mistakes I made as a newbee and blamed on the 201 instead of my own ignorance...I thought all parts were all interchangable) . You can distinguish between the batteries by looking for the small air holes drilled on the threads of the 201's. The 201's cartridges have little curved mouthpieces.