For me and I own both Reo's/Odin's and Sigelei/Lemo everything about the Reo is easier, need to refill slide the door off, unscrew bottle, fill, replace and I am ready to go. With the Sigelei/Lemo I have to take the Lemo off, unscrew the bottom, get a screwdriver, take out the fill screw, fill it, replace the fill screw, screw the bottom back on, and then back on the Sigelei. Same process if you want to adjust the airflow as well.
While the fill screw wasn't a huge deal being right next to the side of the tank sometimes it was a pain to get back in on the first try. In the time it took me to fill the Lemo I could fill at least two of my Reo's maybe all three. And of course no dripping if were talking an RDA, or having to carry bottles of juice around that may leak.
At this point the only thing that could get me to try another tank is if I could get an Erlkonigin for a good price since they have the top fill option with no tools required. I may not have the ability to adjust my wattage but since I have found the sweet spot I like to vape on a Reo there is no need too. The only downside is if I am going to be gone all day +8 hours I need to carry a battery but that's not a big deal for me.
And I don't have to have a pair of married batteries that I need to remember which one I had in which position every time I take them out to charge them. Everything about the Reo in my situation is easier and at this point in my vape journey that is what I was looking for. Not to mention it's built like a tank I can drop it a hundred times and still get the vape off of it that I got before the first drop, I wouldn't think the Sigelei would get dropped more than a few times before something went wrong. And I am not in the habit of abusing my mods but when you're out and about things happen.
Excellent info THANKS!