I guess it depends on what you expect from your gear.
For me personally, yes it WAY over excessive. And its bulky, making it second choice when going out.
But that doesn't mean I dislike or wouldn't recommend them. Solid devices and worth having.
I find Ive been using 2 different builds the most. .6-.9 Ohm build with 26G and a 1.3 Ohm build using 28G.
On the Sub Ohm, I tend to run around 20-25W or so.
On the 1.3ish around 15W (Sometimes 12)
So, yea, 100 is useless for me BUT ... The dual 18650s really last awhile the way I use it. I just charged it up this morning. After just short of 2 days running, it was down to 16% charge.
I could have got by with a 30 - 70W mod Im sure, like the iPV 2 Mini. But I wanted the dual batteries.
That and the fact this thing will fire pretty much anything Im in the mood to build, and whatever wattage, was what sold me.
Its a solid little device and i love it but it is a bit bulky.
if you are interested in one, especially if itll be your only device, watch some videos but more importantly go to a local vape shop and physically hold one. You may find it perfect or too bulky.
When Im out and about, I take my Provari v2 and kayfun setup. At home, I use the Segelei and SubTank. The Segelei doesnt fit in pockets that easily like the Provari does..
Another thing, if interested in them, make sure you get the 'PLUS" version. The Plus has the spring loaded 510. The regular version doesnt and was problematic with the 510 connections at times.
On the Provari/Kayfun lately Ive been running 1.4Ohm (28g) @12 watts. (The ballpark for this setups sweet spot IMHO)
I have the v2.5 Provari which is voltage only. But they recently came out with the P3 which does volt and watt. Its a bit pricey though.
Then they just released a 2105 Clossic Provari that has wattage and voltage settings as well. A bit cheaper, but still pricey compared to others with similar features.
Still, Im a Provari fan. because what they lack in features, they make up for in build quality. These things are built like a truck and will last.
2015 Classic ProVari: Variable Voltage/Wattage Ecig
major downside, they wont fire much below .9 OHm. So serious sub ohm ing is not its things. But for lower resistance builds, 1.2-1.5 PERFECT.