Still havent found much as far a 'unbiased' reviews, lol, gotta love today's internet. Where every review on a vendor's site just beams at the almighty and ultimate item you are interested in.
Seems the main catch is the same a PV's. Use it properly and it should work, screw it up and all you get is a mess or more useless crap for the pile. Havent found anyone with them in stock local so can only squint at the tiny little pictures and try to imagine where things might fit. And ponder the few issues I've seen here and there about the cooling gel expanding too much and making things no longer fit in wallet or even worse getting gel/water on things in the wallet.

I have enough trouble keeping the VG from sliming everything.
Main issue I have with these is they dont appear to be insulated in anyway from what I can tell. I know they need air flow so cant stick them in an insulated cooler or glove box and expect them to do their magic. But still cant quite picture them doing much good if they cant at least keep the coolness trapped when you pull the goodies out of the fridge. Again from what I can gather they are much like your average ECIG..........YMMV
At this point I think I'll have to concede that cooling may not be vital and If it will be necessary the few hours of 'REAL' cool you could get slipping a freezer pack into a sandwich sized cooler would get you through the hottest part of a trip and even when that ran out a layer of insulation would keep the heat at bay till you turned the a/c back on or got back indoors.
If you must hide your stash in the car at work and dont think want to mess with rotating freezer packs, they might do the trick and be worth the effort to master. Recharging would be a simple matter of soaking the gel pack and making sure there is airflow. Assuming it really does work as advertised and you can get it to work more than once (one of the few complaints I found was that it worked great the first time, but then they couldnt get it to work again or as effectively) Kinda like that PV battery that blew your socks off out of the box and now wont hold a charge for more than 30 min for some strange reason which was probably user error.
Also customer service may be an issue if you have an issue, so really want to find something local or may order online through Walgreens if I decide I gotta try it. Till then think I'll see if I have something at hand that can hold my freezer pack and a small supply for the road. Other option for extreme conditions is a thermos bottle with ice thrown in it but would have to give some thought to waterproofing anything other than dripper bottles or maybe use a flexible freezer pack.
Oh they do make regular insulin cases that use freezer packs if you dont believe the hype on the evaporative cooling gel packs or need something air tight/water tight for your particular conditions.