Ok, I spent about an hour with A4 this morning. I decided to focus on just one amp sim, the JCM8000. I didn't use a preset, I dialed everything up from scratch as if it was my own amp. I placed a compressor in front of the amp. An EQ to roll of just a touch of the bottom. I placed the Digital Delay and Reverb on the back end, just a touch of each. Next I changed cabinets, selected the closed Vintage 1 with Greenbacks. Adjusted the mic placement a touch backwards and a little more away from the center of the speaker. I thought it sounded awesome. The tone seemed cleaner, less hum, less fizz. The picking dynamics felt better too me.
The last thing I did was rolled off some volume on my guitar, cleaned up very nicely.
A3 was probably my number one, followed up closely by S Gear. I know a lot of people have a real love for S Gear and everyone states that. I think it is an awesome Sim as well, but A3 usually fit better in my mix. I have a feeling A4 will fit even better. Differences in oppinions could certainly have a lot to do with the guitars people are playing. I tend to play more vintage PAF pickups and single coils that are not as hot as other people play. Maybe my picking dynamics are different than others. All I know and hear, is that this new A4 sim sounds like an improvement to me; and that the new Marshall's sound very good.
Tempt's me to try the Mesa Boogies.