I test-rode this with Trevor (the designer) yesterday. Did about 15 miles on a very good mix of roads, including a cobbled road and a fast downhill, so it got a decent workout. I rode the Sport:
For background, I own a TRICE Q, so essentially I'm comparing it to that. However, in choosing the TRICE I did test-rides on seven or eight different trikes, so I have at least a little experience of others.
My first impression when the link was posted in here was that it was absolutely beautiful, but most likely one of those products that's all form and no function. I remember test-riding the Strida folding bike a few years ago. Gorgeous-looking machine, very clever folding mechanism but utterly appalling to ride. The Innesenti, I'm happy to report, is no Strida.
Trevor adjusted the machine to suit my height, which was as simple as loosening four allen-bolts and sliding the seat back about an inch. Getting into it is a slightly different process to the Q: you grasp the handlebars, apply the brakes and then lower yourself in that way. If it had the parking-brake I have fitted to my Q (an optional extra), it would be even easier, but it's perfectly straightforward.
The seat is
much more comfortable than it looks! If you buy one, the seat is individually moulded to fit you, while I was of course testing a standard one. The seat feels narrow when you get into it but is then comfy.
The Sports model has a two-speed Schulmpf gear at the front. I've never used one before, but quickly got used to it. You tap the centre of the crank with your heel to change gear: left crank to change down, right crank to change up. The rear gears are on a trigger-shift on the left handlebar.
The gearing setup is quite different to my TRICE. I have a triple on the front, set so that I'm on the middle ring 95% of the time, using the small ring only for pretty steep hills and the big ring for fast downhills. This means that generally I'm only using the twist-grip for the rear gears.
With the Innesenti, I needed to use both front and rear, but the Schulmpf is easier to use than a front derailleur. On balance, I prefer my TRICE setup, but it's not a big deal.
Acceleration is fast. It's hard to do a like-for-like comparison as my TRICE has a Streamer fairing and luggage, both of which add weight. I'm guessing that a back-to-back test with a naked TRICE would show them pretty similar but probably a slight edge to the Innesenti.
Handling is excellent. I love the TRICE handling, and the Innesenti is even better. Very sharp, very stable, and the very significant negative camber on the front wheels gives a lot of confidence in fast cornering. I gave it some abuse in Hyde Park, and it just turned in. Like the TRICE, when you overdo it, the front wheels slide. Lovely.
The steering is direct. This makes it both quicker and heavier than the TRICE. I was surprised how quickly I got used to the difference - literally within a few bends. I disliked it initially, then grew to like it more and more during the ride. By the end of the ride, I still prefer the TRICE indirect steering, but there was less in it than I thought there would be.
The most surprising thing to me was seat comfort. I've tried a hard-shell seat before and found it very uncomfortable. This one was well-padded, and is mounted on elastomers. These absorb both bumps and vibration really well. Trevor's confidence in this was evident when he led me onto a cobbled road! I found I was able to ride across cobbles two or three times as fast as I would on the TRICE. By the end of 15 miles, I was starting to find the seat a little hard, but I'm guessing that a body-moulded seat would make quite a difference.
On a fast downhill, I'd guess I reached around 40mph (I forgot to take my GPS with me) and it felt rock-solid. You'd obviously want to test it on a longer and steeper hill than can be found in central London, but certainly the signs were good. Personally, I'd want bigger gearing at the top end for high-speed downhills, but I have custom-gearing on the TRICE for that reason and I'm sure Innesenti could provide the same.
I'd want luggage, but I'd imagine the Radical Sidepod bags I use on the TRICE would also fit this. I certainly can't see any reason why not.
Overall assessment? I'd say that it's probably 10% nicer than the TRICE in terms of overall performance. For my budget, there's no way that would justify the huge price-difference, but then I'm not the target-market for an £8k trike. I do think it's every bit as beautiful in the flesh as it is in the photos, so if I had four times the cash to spend, I'd certainly be tempted.