There are other vapes on FC that consistently get good reviews of both the vapes themselves and customer service. The HI & UnderDog (also logs created and produced by one-man shows) and MFLB (by a company who stands behind their product and takes care of customers well), come to mind off the top of my head - but sure there are others, too. Not to take anything away from Andy (or Gary), but we're fortunate to have such a great community here with manufacturers and vendors who participate regularly and share the love. Even though threads for some of the more popular vapes grow quickly and can be cumbersome to sort through, you won't find a better source of information for vaping than FC!
There have been more than a few posts on this thread comparing both to the nano. Hard to search on HI (because only 2 letters), but search just this thread on Underdog and troll through for HI to find plenty of info.
A thread with a little bit about differences between
UD & nano .
A thread comparing
HI & nano .
Keep in mind, challenges of this vape vs. that one are frowned upon for the most part on FC. Understandably so, as such discussions usually degrade pretty quickly with fans of either lining up against each other.
Some objective differences:
nano is AC, electric cord with dimmer to adjust power/heat.
HI & UD are DC, power/heat can be adjusted with variable voltage power supply.
nano uses all glass stems and gongs.
HI has MANY stems/gongs from all glass to silicone to cork (some are reported to fit nano).
UD uses primarily silicone on the port (AFIK - please correct me if necessary. haven't been on that thread lately).
Exotic wood differences with all, UD made in different shapes.
Pricing from high to low - UD, nano, HI
General wait time (if not getting specific wood) from less to most (generally) UD, nano, HI. This changes some with availability of UD and nano. UD out of stock right now, but think that is pretty rare. Think nano is in stock now. HI has a waiting list that is currently at about 1 year.
Personally - I've only used an UD a couple times and liked it, but like my nano a lot more. Regrettably, I've never tried an HI - but I'm on the wait list. Think all of these will get you there pretty easily (though HI seems to have more of a learning curve), so any would be a great choice. But for me (right now at least), the nano is king of the roost. Do your research and let us know what you end up with.