Adding to the previous post, I just recently switched to 901s from 510s at the behest of several veteran vaper friends and at HV, I have yo say the 901 seems to have more vaper and more flavor. The draw is smooth and complex flavor come out. For me there is no going back... Don't get me wrong, the 510 is a fine atty and great for someone starting out due to all the available ohm LR, hv, etc. and they are also very forgiving. I only have one mod that uses 901 native, I us 510 to 901 adaptors from Good Phrophets, but there are many vendors that carry them.
Best of luck and enjoy - vape on