I've been watching these guys pretty much since they started. If they're anything like the MP3 family then they're going to be VERY sure footed on greasy/oily damp roads or where there are tramlines.
For anybody who wants to keep riding and is maybe getting a bit weaker/older or even gets a bit dizzy sometimes (blood pressure) - they offer advantages.
Depending on HOW the lock works - maybe it could be made to actuate electrically. And whilst the bike may flop over it would not FALL so if it "goes" you can let it.
The extra weight actually would be fair and square on the ground and low - so doubt it's noticeable.
The 500cc MP3 will leave a lot of 2 wheeled bikes in bends especially in poor weather: so will the 300 and even the old 125. Last year met a couple (in the ferry queue) - on matching Hibrid MP3's. Both in their late 70's.
Personally I doubt I'll be riding a "bike" from Scotland to Southern Spain when I'm 70. Tough oldies!.
The "tilting" R3 challenge may be the fact the engine is not in a cradle - rather it is a major part of the chassis - anchoring the front subframe maybe an issue.
Thing is - esp in the US - is it worth it? - I looked at a Slingshot - which here are simply STUPID EXPENSIVE and whilst it is a 3 wheel car - it has some advantages. It is also BIG which sort of defeated the idea.
But in the US - the price is reasonable.
A Morgan is well out of my price league. So is a TRIKING.
In the UK I would (with no doubt whatsoever) already have a BlackJack Zero KitCar.
But it will not pass homologation here. I've asked.
Somebody must be close enough to go and have a look/play with a Tilter though surely. Do I detect fear of falling in lust?