3 years ago I started vaping with a crappy cig alike. Quickly moved to an ego. Started getting VERY frustrated by the constant tinkering and fiddling and needing a bag of supplies to carry around everywhere. I did my research, and found the perfect machine, a REO Grand. Fill a bottle once a day, change a battery once a day, no junk to carry around. I was sold. It even carried the added bonus of being able to use the best atty available back then - a 510LR, which I had a ton of from my ego. I bought it and never looked back....until a week ago...my attys (same ones from 3 years ago) have been getting annoying. I came here and asked a bunch of similar questions, then went for it. I'm not kidding when I say this- I am the absolute LEAST mechanically inclined person you'd ever meet. And I did it. First try. Been using it for a week. Easy cheesy lemon squeezy. Tonight I'm going to build my 2nd coil, because this one has a screwy spot that's hard to stuff a wick into. If this one works out, I'm probably going to just go with that one for a month or two.
If you are looking for a machine that is designed to be less hassle than other ones, this is what you need. Still don't want to try an rba? Buy some 510s. The REO won't be an issue. It just works.