Hey all, I saw this discussion and thought I'd drop by. I just took the 390 Adventure home a few days ago and here are my thoughts.
Unless there are some long-term reliability issues with the bike, it's a winner. I only have 250km on it so far (a winter blizzard unfortunately just hit my area), but KTM really did pack this thing full of welcome features. Yeah the TFT display and the ride by wire is nice but to some people the over-dependence on electronics can be a drawback. So far so good. The standard hand guards are awesome, the adjustable suspension as well as adjustable levers are great. The bike has ABS and Cornering ABS as well as offroad ABS (disables ABS on the rear wheel). It has all LED lights... all the standard stuff you already know. But being presented with this package and owning it is another thing. It's comfortable and quick. Also it sounds much better in person than it does in the hundreds of YouTube videos from India that no one wanted to watch but had to because they were the only videos of this bike.
Anyway, the best part about it in my opinion? How nimble and light the thing is. I've taken it offroad through different terrain (mud, sand, loose large rocks, gravel), and it does the job. I heard some people complain about the cast wheels. What are you, Evel Knievel? Chances are you won't be able to take the bike to the wheel's limits. As consumers we get spoiled because this really is the golden age of motorcycle development. This makes us very discriminating when it comes to nuances between motorcycles.
As an example, remember this? Clearly not meant to be an offroad bike, but it was put through its paces.
Extreme example. I digress.
Other downsides I've heard mentioned are the tall seat height. That is an issue if you're short. I'm 5' 9" and I can't complain (but I also can't flat foot it).
I've heard mentioned that the 373cc engine doesn't have the low end torque for offroading. If you know how to use clutch and throttle you'll be fine. The thing revs up very rapidly.
Issues I've encountered:
Twice after cold starting it, the engine shuts off after a few seconds of idling. I've had this happen with other bikes as well (I rented a 790 Adventure in Vegas a few months ago that did that). I remedy this by applying a slight amount of throttle. I hear it's because the engine runs lean.
The left mirror came loose. I've seen this happen in the aforementioned videos from India. Turns out that it was just not tightened enough to begin with and could use a few more twists.
The front windscreen sometimes vibrates and makes a buzzing noise. I've also seen this in those videos.
Having said that, it looks like whatever standard these bikes are built to is exacting to even the smallest quirk.
A small gripe: it has no ambinet temperature reading on the TFT display like the 790 Adventure. What gives? All adventure bikes should have a temp reading!
Overall I think the best aspect about this bike is its small and quick package which provides you with a lot of comforts and options as a rider.
Anyway, I'm thoroughly enjoying it and waiting for the weather to lift since I'm already getting withdrawals.