Hi folks , After some time trying other things ,joye 510 , riva , ego, and various mods I am happy to say i am back to V4L. A little while back I was having troubles with some of the premium carto's from v4l. I was having issues with burning trouble's with carts that were brand new , instead of getting ahold of v4l and letting them know I was upset . I just went elsewhere..I tried the 510 and although I did like it at first , leaking cart's and lots of time spent playing with different cartridge mods . I gave up and bought some 510 cartomizers.. The one's I purchased were from 3 different supplier's. and all three had the same problems , way to much airflow!! another problem i was having was with battery life. so I tried mega 510 batteries , and they were better , but still battery life just wasn't there .So on i went to the riva and ego, The battery life was great but everywhere i went outside my home , i felt like it just looked like some sort of crack pipe to others around me.Also the 510 just runs too cool so if you use anything other than a joye atomizer the vapor just isn't there. So I am back and looking forward to whatever new things V4L has to offer