I'm in the same boat and have been hearing a lot of good things about the sigelei 100w plus. I want to upgrade from my 20w so I can get into the RBA and RDA setups.
A famous misconception is just because the box mod is capability is either .1 or .2 I should run it that low. Not really true. When you build that low, you're getting into ohms law which these mods chips, will limit the voltage you get topped out. It's mostly a good idea to build higher ohms...say around .6 to 1.2.
You'll still get a GREAT vape and if you build with lots of wraps, great flavor too. Read any reviews from retail web sites of YouTube and it's what you'll find.
And as I said a few posts ago....stellar battery life.
Two examples....
On my Sig 150 and IPV 3, I run an orchid for my work vape and they're built at .65 and one at .9.
At 33 watts.
At .9ohm the voltage is set to 5.4 (to hot a vape for me, usually run this coil at 21.5watt to get 4.3volt)
At .65ohm the voltage is set at 4.29
The lower the ohm rating, the more power you'll need to fire it and chips do get warm and batteries drain faster. Plus you're limited on voltage at lower ohms too.