I more or less ditched the Spinners the day the iStick hit our shops.
The 20w should be avoided. The 30w is great and the 40w offers Temp Control.
The 50w and 100w are getting towards twice as wide, taking 2 batteries. Not for me, in that size.
Most of my vaping is done out of my pocket, so small box mods are essential. Even the Sigelei mini is not mini enough and the Cloupor mini weighs a lot...