Got my Pico yesterday and it's a great little mod. I'm trying to get used to the shortness of it as the way I normally hold a mod and fire it with my thumb is a little awkward with the Pico because the fire button sits lower. Here's a picture comparing it with istick 30w, istick 40w and the VTC Mini. You can see that the fire button sits lower.
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Nice line up.

I find that the button placement on the Pico is much more friendly to finger-firing than using one's thumb. I wrap my hand around the mod, (pinky underneath), and squeeze the fire button with my index finger. I find it very comfortable, and only the topper is visible when held in my hand that way. I always keep display stealth on because who cares about counting puffs, and I imagine it also saves a little bit of power. I often like to vape on the proverbial DL when in public.
Ymmv.