Lol! I have a similar experience, except the opposite. My H2 is in for 30K service, and I got an H3 loaner.
The steering wheel is "beefier" than the H2 -- quite comfortable in city driving, but curious if it will be fatiguing in 8 hours of off-roading.
I agree with the "feel" of more space in the H3, but I take exception on how tight the space around the accelerator pedal is on the H3. The right side of my shoe must be in constant rubbing with the trim to avoid the break pedal. Any way to heat mold the trim flatter, or move the break pedal a coupla inches to the left?
The H3 is MUCH quieter than the H2. Very nice ride!
The power of the H3 is not bad at all. Plenty adequate for city driving, perhaps a tad under powered to cut & overtake in freeways. Maybe it's because I drive an H2 -- which while quick, ROARS to get it movin -- but to me the H3 power is not a cause to complain about.
Used to not watching the gas pump when fillin the H2, I think I put about $30 TOO MUCH for the rental. Have barely use 1/4 tank so far! Gas mileage is excellent!

But whatdayaexpect? It's a baby H2!
Love the center console. Prefer my H2's "boobies" A/C vent though -- go figure..
The on-star on the mirror is best. Can't figure out why the H2's need an entire din.
Rear visibility of the H3 SUCK ASS!! Worse than the H2! Definitely need rear-camera or ultrasonic back-up sensors, esp if you're around small children.
The strong "push" of the struts on the rear hatch takes some getting used to. But much more useful design than the 2 steps needed on the H2 with the rear tire carrier.
All in all, I definitely enjoy the experience. Not as
LikeNothingElse experience as the H2, but I wouldn't mind one in the driveway as a second Hummer
