I got the ASG-1 Rev. 1.3. about a week ago, and I haven't had much to listen to them yet, since I'm giving them a 200-hours burn-in treatment, but from the little that I've heard, my impressions are quite positive. The sound produced by the new in-house drivers is quite smooth, yet combined with a good amount of details, and the mids are slightly forward. I like the bass amount, which gives the sound a fun feeling but doesn't shadow or over-power the other frequencies. That is as far as I'll go in regards to the sound, because as I've said, I had only a small amount of listening time. Once they'll have more than 200 burn-in hours I'll start the critical listening, and I'll then write a full review (and I'll post here a link to it).
The new shells fit so much better in my rather small ears, mainly because the annoying bump that was in them in the previous versions is almost completely gone! Back when I had my Rev. 1.1s, I could not wear them for more than 20 minutes due to the bump, but now, I almost don't feel the shells when they're inserted.
There are also some new tips, some of which I've found to be quite good in terms of comfort. The new nozzle holds the tips more strongly, but I still had a pair of bi-flanges come off inside of my ears. I found that Comply TS-400 fits nicely on them, and that is my current tips choice, but be sure that I'll continue with the tips-rolling.
Here is a little story regarding to the new shells: the same month, a year ago, I got the ASG-1 Rev 1.1 straight from Aurisonics. Immediately upon receiving them I noticed that the shells didn't really fit well inside my ears and caused some discomfort. So what did I do? I have contacted Dale and told him about that. He then asked me to send him some pictures of the IEMs inside my ears, and so I did. I have also explained to him in detail what was causing the discomfort. He then shared with me that he was developing a new shell with the bump "shaved", for people like me, which found Rev. 1.1. to be uncomfortable, and that is what became the Rev. 1.3. It shows you how much Dale cares and how much he takes the users' feedback seriously.