Our previous Jeep was a 98 Wrangler SE with four-cylinder, 5 speed manual. The new critter is six-cylinder with a six-speed. Ironically, the highway mileage we're getting is better by far at 70 mph than the four-banger got. This Jeep is also quieter with full doors with roll up windows. So far we have had no problems. Lots of plastic on the interior, but it's washable so who cares. Plastic cladding over the bumpers is a bit un-Jeep, but everything else is pretty rugged. Sixteen inch wheels are also a plus. We found with the old Jeep that tall skinny tires work best in snow. That is also the experience with the '07 as well. Just go with factory wheels.
More side to side interior room. Quieter soft top. Lower rpm in most gears than the old jeep ran at. Smoother running on the highway. Disc brakes all around are a plus. Suspension is much better.
Get the plastic cladding off the bumpers. Put a better soft-top edge over the full doors so that when you open a door in rain you don't get a stream onto the edge of the footwell carpeting. Shift from fifth to sixth is a real reach - be careful.