Mini review of the Jettle. I used it for about a month while traveling.

pros
>quoted time of 4-5 minutes to boil fairly accurate
>inside is all enclosed metal, so you could boil other liquids if you wanted
>has most of the temp settings teafags like
>will hold at non-boiling temps indefinitely

cons
>can't set the exact temp. degree
>not great for storing/carrying water--steam vent in lid means water can spill through it if tipped over
>holds 450 mL, long gongfu sessions will require multiple refills

Costs $40 on Amazon. I would say it's worth it. Not that more expensive than the no-name chink versions and backed by a seemingly real company.