Hi Andy
I've been holding off comparing the 08 Vision to the 10 Ultra Limited with the 103 engine, my intent is to provide a fair review once I slow down. But here is a condensed synopsis.
Vic is a more powerful motor, but I despised the roar of the intake. The HD is actually quieter, less valve train clatter, and starts the way a motor should, instead of the annoying Chrysler Slant 6 starter sound. They exhaust has a pleasant sound, louder than the stock Vic, but quieter than a stage 1. Your neighbours will love you.
The new HD's have redone their exhaust plumbing to reduce rider felt heat and it also has the rear cylinder management system, where the rear jug shuts down at idle to reduce heat, and it becomes an air pump cooling the motor further. Also added is a heat deflector under the seat. I haven't ridden in hot temps yet, but I'm sure it can't be any worse that the Vision.
The lower fairing is vented so you can direct cooling air to your legs, or close them if you are cold. There are also adjustable vents on the batwing fairing too.
Vibration at idle is higher with the HD, but at speed or WOT it's about the same as the Vic. Mirrors are perfectly clear.
HD transmission is smoother and shifts quieter
HD switches are more glove friendly
Radio, I get clean AM, pull in remote FM well, have a CD player that also plays MP3 CDs so you can burn a CD in MP3 format and get 10 hrs of music on it. The display will show the artist's name, song title, and track number. Built in intercom and a Breaker Breaker good buddy if you care to use it, included is one head set. There is also an AUX plug so you can plug in your MP3 player or GPS. You don't have control of the MP3 player as you do with the Vic's iPod interface, but you can buy it from HD for $$$$$$.
12VDC plug in the trunk. Trunk is lined, and it came with all 3 tote liners for the bags and trunk. The locking mechanisms are A1
ABS, security system, trunk rack, extra chrome, premium gauges, chromed wheels and heated grips included.
Fit and finish are paramount, all wiring is neatly routed, and secured. Take a look down the Vision's centre counsel to see what I'm talking about.
HD has a one size fits all philosophy. At first I felt cramped, but not uncomfortable. I now realize other than adding a backrest any other modification to the ergonomics would be fruitless as it's fine as is.
First service was done today at an Indy shop, just under $200.00. It was due at 1,000 miles. Engine oil changes are 5,000 miles, primary is 10,000 miles and transmission is 15,000 miles. I had them use Shell Rotella T, a diesel engine oil (approved by HD), it was $13.00 for 4 quarts, yes all 4 quarts, not one. HD air filter is washable and reusable, better for the environment.
Vics service life for the drive belt and pulleys are 25,000 miles, there is no service limit with HD.
I have no wind buffeting even though I look over the top of the windscreen, but the Vision has better wind management, as the HD allows air between the lower and upper fairings, which blasts your knees with fresh air. Probably a plus in you hotter climate.
HD has Brembo brakes, on par with Vics
Handling; Vissions because of their long wheelbase and rake angle make you feel more confident at high speed turns, but are slower to react when a change is required, i.e. debris on the road. HD's are very flickable at both high speed and low speed and responds very quickly to rider input, there is no lag. The HD felt almost toy like when I first starting riding it, as I had forgotten how easy they are to ride.
Gas mileage is about the same as the Vision.
Seat is comfortable
Lighting is better with the Vision, (HID), but HD sells LED headlights that are super bright for about the same $$ as it costs to add the HID to the Vic. The rear lights are better on the HD.
Trunk and side bags, HD wins this one without question. Top loading is nicer, sides are easily removed with 2 quarter turn fasteners, hinges and locks are superior.
Sorry if this sounded bias. its how I see it
brian