Just wanted to chime in as well. I'm actually playing GH1 first although it looks like all the discussion on the forums here are pretty much about GH2. Sounds like GH2 is still being worked on though so that's fine.
Huge tactical game nerd, sadly there's a dearth of these kind of games (good ones). Purchased Titans of Steel from Matrix Games a long while back and have been playing the crap out of it. It's pretty much combat-only though, so when I read about Gear Head I nearly couldn't believe my eyes when I skimmed through the features.
One wee thing though; it's pretty daunting for a newbie starting out from scratch. I know I probably should've picked Basic Mode during char generation but hell, I never was one for prefab chars so I dove into Advanced. Long story short, I learned the hard way that having zilch charm means pretty much everyone won't want to talk to you after even a bit of conversation, low body means you can't carry - let alone wear - any gear worth crap and thus important stats (reflex, speed) will be permanently in the red, etc.
The wiki's great but it could use some more starter info. I'd love to pitch in but right now I'm just learning about the game myself.