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Been using a Pico for the last 3 months. Bought it as a back up / holiday device but it's now my daily. For the money it's an amazing device - as you say swappable 18650, good battery life, temperature control , great size - what's not to like.
It's also breathed life back into the kanger subtank mini that I'd written off - they are great cheap combo. After the pos Rx200 I had (lasted 2 months before the 510 pin got stuck - shit battery life) I'd highly recommend.
Picked this up as a stealth setup. All black, and removeable 18650 which was the selling point over other devices.