I don't know nothing about Hummers in particular. But i saw some and i think they are cars with some common properties:
pros:
- known powerfull fuel based engines
- resistant metal structure designed for long hard use
- good tires for hard condition roads. mean adherence and quality resin
- sales&service assistance in many countries
- good image of power
cons:
- high costs: product cost; maintenace cost; high consumption of gas
- requires very good abilities to drive in less comfortable conditions
- because of its value could be subject of envy and potentially stealth
Advice: consider your/ yours actual and future budget to determine balance between monney expenses and incomes this car could bring you (consider extra cost as taxes); it also needs parking place, washing, gasoline, break fluid, battery maintenace and so on like most cars do. Try to get information from hummer owners and users. this way only you'll know what to expect from this car, commercial info is obviously subjective.
Possible helpfull information: Jeep Wrangler's were close enough; i drive one couple of times and found difficult to handle at first attempts. Very sensitive as direction, brakes and pretty tough suspension. But you can rely on it on snow; ice; dust even in extremely conditions as temperature or air flow; very good stability on plain or obliques surfaces. But God you need strenght to change a tire, to move it when traction crashes for one reason or other. Good move is to foresee if some spare parts as fuel injectors; electric bulbs are subject of ussually changing and to buy them as caution. Also minimal tools such as air pump or compressor, screwdrives and things like these are sometimes benefic. And last but not least: need friends to ask and to help you.
Good luck. May it be only your first car...
Best regards