No familiar with the RN4072, but did want to welcome you to the ECF and many folks advise on the 510 for a beginner. I went that route too, but have quickly outgrown it
for something with a longer battery life. If you are positive you are going to stay with
vaping, take the plunge if you can to good quality.
I have not used the EGO (yet) but
have the longer lasting models, as the Silver Bullet, the Chuck and soon a GLV along with a Vapre51. The battery life is so exceeded in a couple of the models I have, the Chuck at 3.7 has an easy two day battery life. The Silver bullet at 6v last longer also..but not two days. There are several great quality units out there, do your homework and find your aesthetically pleasing design and unit. Again, welcome to ECF