@Old School Check the candidate section for portables. Downside vs GH: no way to charge it w/o taking the batteries out and putting them in a separate charger. No temperature control, you have to push a button in a pattern to heat up and maintain temps. No stealth, unless you tell people you are carrying your kid's woodblock. The advantage over GH: it prob has a bigger heater. longer battery life. glass air path (other than the heater).
I think they are very different animals.
Zion does have a voltage knob, and it works remarkably well for temp stepping by the way, while not exactly temp controlled precisely, I find it extremely effective and intuitive personally.
Hoppers precise temp control in on demand convection is very valuable though, and fairly unprecedented I believe for a portable, nonetheless one so small and stealthy...
@RastaBuddhaTao is also working on a bare bones single battery portable too
@Old School, like a convection mflb (I describe Zion as an MFLSV, simple wooden portable with on demand LSV desktop power + 18mm glass)
Doesn't have the fancy new age tech and bells and whistles of GH in that package, but Zion is super effective and super simple, minimal design and materials, all pure and natural
It will be very interesting for me to compare when my Hopper comes, since I've always belived in it and based on what weve heard, but the Zion is just so intense in the best way, insanely powerful and versatile imo. Just check out my beta test posts in the thread
EDIT: another thought re batteries Zi vs GH:
GH you get usb, use while charging though not pass through so you have to wait for some charge and may not be great for battery longevity, but they will eventually have an external charger for sale they asure. However their batteries are proprietary and their size, and battery life is limited (though I do think 3-4 bowls sounds like plenty), reasonably quick charge time at just over an hour too though, like FF kinda quick to charge and discharge.
With Zion you get standard 18650s, any mah and these are plentiful for some, a standard size available in stores. Though it takes two (single battery mini version takes one though), the battery life is super long, like 5-8+ bowls probably depending on load size and voltages used. Yes you must charge separately in any charger (nitecores i2-4 and even better d2-4 work great, we don't know about GH and them), but charging separately does allow you to not be dependent on the devise sitting there to charge like I would need to do with my Firefly proprietary batteries (since i never got their own proprietary external charger).
RBT also plans to offer AC pass through packs so you can also plug Zion and its bretheren in to run true pass through off the wall power... I hope/presume Grasshopper is planning some thing similar way down the line too actually