Ditto on the Picos for durability.
I've dropped my green resin Pico at least a half-dozen times on concrete, tile, blacktop and they still perform. My Crown Mini tanks that I use on the Picos have yet to break completely. They've been dented and scratched up a bit, won't work in TC anymore (something holding the pin broke), but the glass is still intact and they still work in wattage mode. One time, I had my Resin Pico in my hand while flinging my hockey blanket over a bathroom stall.. Forgot it was in my hand... It hit the floor like a ton of bricks... Still works.
Not the best mods, but these babies keep right on working! Maybe I didn't need the dozen or so backups, then?
Annnnd ... double ditto on the Pico
My preference is for pocketable, small, durable, box mods that do VW up to 30 watts and have a passable TC mode. I don't like tube mods, tall mods, or squonkers. The Pico 75 just does it for me. I've got 5 of them now, a couple of replacement circuit boards, and enough experience with maintaining them so I figure each should last me two or three years if I take it to work every day. And I strongly suspect before I run out of them I will have discovered a new 'best' mod.