I test drove a hardtop Sport this weekend (no one had rubicons in stock). Some things I was pleasantly surprised about; exterior size, noise, comfort, power, transmission, steering, etc. Somethings left me missing the 100; cargo room, interior quality, engine refinement. So it's really going to come down to is the unique appeal of a Jeep (stock capability, doorless, topless, aftermarket support) going to be enough to compensate for it's short comings. Cost is a concern but not one I want to discuss. My wife is on board with replacing the 100. And we both agree that the cost will probably be worth the advantages: less time/money spent repairing, increased peace of mind, warranty, better fuel economy, easier to park, fits in most parking decks, less prone to trail damage, improved capability, lighter, improved traction options (sway bar, traction control, LSD, triple lockers), Doorless/topless options, cheaper aftermarket parts, better stock gear ratios, etc.
Details:
It had street tires but, the road noise even at highway speed didn't seem any worse than my 100 with AT tires.
I was surprised at the ride quality. I've only ever driven 2dr Wranglers. The longer wheelbase of the Unlimited really smooths out the bumps. The steering felt way more precise than on other solid front axled trucks I've driven (40, 60, 80 series). There is considerable nose dive and the ride isn't as composed as the 100 was stock. My wife didn't notice a difference, but she never does.
It was hard to judge build quality because it wasn't the nicer Rubicon trim level. But we looked at some Saharas for a comparison. The 100's interior quality is obviously higher even considering it's age. There couldn't possibly be any more black plastic inside the Jeep. I can excuse some of the materials, like the arm rests, door panels, and seat fabrics because they're purposely designed to be water resistant. But the carpeting, door handles and switches are needlessly crappy. I guess this is where they skimp to keep the price down.
The power delivery is a lot different than in the 100. The 100's somewhat underpowered V8 doesn't ever really surge. Power comes on slowly, smoothly and predictably. The Wranglers engine seemed a lot more peaky. Almost reminding me of a VTEC engine. The power seemed adequate and then really gets up and goes when you stomp on it. I wish there was a little more useable torque lower in the rev range.
Front seat room seems about the same. The wrangler was just skinnier on the inside, which I don't mind. The Wrangler dash is much more vertical and the center console much lower, which might be giving the illusion of more space. The belt line on the Wrangler is much higher, which I didn't like. But unlike the 100, there's headroom to spare and you still have a commanding view of the hood and road. The general vibility wasn't as good as the 100 but it's liveable. It is a smaller vehicle so that makes it slightly more excusable.
I drove the test car to my condo to see if it'd fit in the really low subterranean garage door opening. It fit, but just barely. The saleswoman got nervous. The Rubicon is slightly taller and probably wouldn't fit. So I guess my wife gets to keep the garage spot and I'm still stuck out on the street. Which isn't too bad since the bumpers are all flat black plastic and the doors are so far in from the fenders than parallel parking and parking lot dings will probably be far less prevalent than on the 100 that seems to develop a new rear door ding every other day.
Obviously the rear seat and door openings of the wrangler are far less comfortable and smaller. But there still seems like there's plenty of room for a fridge on the folded down 40% section. And enough room for our dog on the 60% section.
Rear cargo room is obviously way less. Currently we try to pack the 100 so that the cargo doesn't come above the middle seat back, as to not block the view out of the rear. This won't be possible in the wrangler. The spare tire and wiper motor block most of the rear view already. This is a concern but we already bring way to much crap and need a better storage solution anyway. We've never dealt with it because the inside of the 100 is enormous. With a shelf, sliding cargo tray and maybe a tailgate basket or small roof rack, the wrangler should be fine even for 5 day trips. That will change when we have kids. We'd probably have to resort to a full roof rack or a Ruger trailer.