Weight and comfort in hand wise, how is the Pico comparing to the iStick 30w? I love my 30s!
If you love your 30w and don't need more power, and your battery life is doing okay I don't think you need to upgrade. The Pico feels fine, but it's wider. It feels solidly built though. The signal on it is smoother as well because it doesn't have as much pulse width modulation as the 30w.
Sorry, I don't really have a good answer. I really like my 30w though. If you're sub-ohming, you may benefit from the extra wattage, but if you're not, you're probably in the 15-18 watt area at most and would be fine with the 30w.
Maybe these pictures I just took will help.
TBH, if I could have the Pico features and battery size capacity in the 30w body, I'd probably take it. I do like the matte finish of the pico though. The matte finish probably won't look as crappy as the glossy 30w after it gets banged around a little bit.