i have had the prodigy for a little over a month and i got the 801 version....i just couldnt get into the hv vaping with it....nothing i did worked....but i found my sweet spot....i had an adapter to go from 801 to 901 that i got with my js....i put a 90 in it (the one from altsmoke) and the vape at 5v is amazing.....i finally found my sweet spot for hv vaping......