Just got in my A83's after returning the DN-1000 and GR07 BE. Initial impressions in the first few minutes was the feeling of a little less fun due to less bass than the previously mentioned, but this was with stock silicone tips. After several hours and tip testing, the soundstage, mids, and highs, and clean fairly north of neutral bass really impressed.
The highs are fairly high close to sibilant at first, but are actually really smooth and quite comfortable that its very enjoyable and desirable. The mids are clean and forward. The bass is less deep than DN-1000, but is still north of neutral and very tight and clear, but not punchy. The best part is how all of it actually all comes together with a great soundstage. I just seemed very engrossed into the music not just audibly, but emotionally, if that makes sense. At $279, I'd say this is an upgrade in sound and clarity with a slightly warmer signature from the mids than the DN-1000 while being as "fun", if not more, than the GR07 BE.
Not sure if I would have paid MSRP $350 though, but I've never bought any IEM's this expensive or more expensive, so wouldn't know how they would compare in this price range.
The stock silicone tips seemed ok, but too deep insertion. The Comply T-400 medium I usually use didn't fit too well. Now using the Comply TS-500 medium which fit really well, very comfortable, and doesn't insert deeply.
I'm 99% sure I'm keeping these A83's, but bringing in the Tenore for a budget one to toss around, and still contemplating testing the Titan as a 2nd toss around. Still trying to figure out this price/performance thing.